Physics: The study of those aspects of energy and matter in terms of elementary principles and laws. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Health Physics: The science concerned with problems of radiation protection relevant to reducing or preventing radiation exposure, and the effects of ionizing radiation on humans and their environment.Chalcogens: The elements OXYGEN; POLONIUM; SELENIUM; SULFUR; and TELLURIUM; that form group 16 (formerly group VI) of the periodic table.Radiation Oncology: A subspecialty of medical oncology and radiology concerned with the radiotherapy of cancer.Chemical EngineeringRadiation ProtectionHospital Charges: The prices a hospital sets for its services. HOSPITAL COSTS (the direct and indirect expenses incurred by the hospital in providing the services) are one factor in the determination of hospital charges. Other factors may include, for example, profits, competition, and the necessity of recouping the costs of uncompensated care.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Stars, Celestial: Large bodies consisting of self-luminous gas held together by their own gravity. (From McGraw Hill Dictionary of Scientific and Technical Terms, 6th ed)Astronomy: The science concerned with celestial bodies and the observation and interpretation of the radiation received in the vicinity of the earth from the component parts of the universe (McGraw Hill Dictionary of Scientific and Technical Terms, 5th ed)Convection: Transmission of energy or mass by a medium involving movement of the medium itself. The circulatory movement that occurs in a fluid at a nonuniform temperature owing to the variation of its density and the action of gravity. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed; Webster, 10th ed)Wolves: Any of several large carnivorous mammals of the family CANIDAE that usually hunt in packs.Planets: Celestial bodies orbiting around the sun or other stars.Astronomical Phenomena: Aggregates of matter in outer space, such as stars, planets, comets, etc. and the properties and processes they undergo.Mydriasis: Dilation of pupils to greater than 6 mm combined with failure of the pupils to constrict when stimulated with light. This condition may occur due to injury of the pupillary fibers in the oculomotor nerve, in acute angle-closure glaucoma, and in ADIE SYNDROME.Telescopes: Instruments used to observe distant objects.Galaxies: Large aggregates of CELESTIAL STARS; COSMIC DUST; and gas. (From McGraw Hill Dictionary of Scientific and Technical Terms, 6th ed)Hong Kong: The former British crown colony located off the southeast coast of China, comprised of Hong Kong Island, Kowloon Peninsula, and New Territories. The three sites were ceded to the British by the Chinese respectively in 1841, 1860, and 1898. Hong Kong reverted to China in July 1997. The name represents the Cantonese pronunciation of the Chinese xianggang, fragrant port, from xiang, perfume and gang, port or harbor, with reference to its currents sweetened by fresh water from a river west of it.Spectrophotometry, Atomic: Spectrophotometric techniques by which the absorption or emmision spectra of radiation from atoms are produced and analyzed.Spectrophotometry: The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.Photometry: Measurement of the various properties of light.Telefacsimile: A telecommunication system combining the transmission of a document scanned at a transmitter, its reconstruction at a receiving station, and its duplication there by a copier.Artificial Intelligence: Theory and development of COMPUTER SYSTEMS which perform tasks that normally require human intelligence. Such tasks may include speech recognition, LEARNING; VISUAL PERCEPTION; MATHEMATICAL COMPUTING; reasoning, PROBLEM SOLVING, DECISION-MAKING, and translation of language.Retinal Pigments: Photosensitive protein complexes of varied light absorption properties which are expressed in the PHOTORECEPTOR CELLS. They are OPSINS conjugated with VITAMIN A-based chromophores. Chromophores capture photons of light, leading to the activation of opsins and a biochemical cascade that ultimately excites the photoreceptor cells.Support Vector Machines: Learning algorithms which are a set of related supervised computer learning methods that analyze data and recognize patterns, and used for classification and regression analysis.MedlinePlus: NATIONAL LIBRARY OF MEDICINE service for health professionals and consumers. It links extensive information from the National Institutes of Health and other reviewed sources of information on specific diseases and conditions.Hearing Aids: Wearable sound-amplifying devices that are intended to compensate for impaired hearing. These generic devices include air-conduction hearing aids and bone-conduction hearing aids. (UMDNS, 1999)Chara: A genus of green plants in the family CHARACEAE, phylum STREPTOPHYTA. They have a strong garlic-like odor and are an important food source for waterfowl.Consumer Health Information: Information intended for potential users of medical and healthcare services. There is an emphasis on self-care and preventive approaches as well as information for community-wide dissemination and use.Radar: A system using beamed and reflected radio signals to and from an object in such a way that range, bearing, and other characteristics of the object may be determined.Workflow: Description of pattern of recurrent functions or procedures frequently found in organizational processes, such as notification, decision, and action.Evolution, Chemical: Chemical and physical transformation of the biogenic elements from their nucleosynthesis in stars to their incorporation and subsequent modification in planetary bodies and terrestrial biochemistry. It includes the mechanism of incorporation of biogenic elements into complex molecules and molecular systems, leading up to the origin of life.Software: Sequential operating programs and data which instruct the functioning of a digital computer.Educational Measurement: The assessing of academic or educational achievement. It includes all aspects of testing and test construction.Blogging: Using an INTERNET based personal journal which may consist of reflections, comments, and often hyperlinks.Biology: One of the BIOLOGICAL SCIENCE DISCIPLINES concerned with the origin, structure, development, growth, function, genetics, and reproduction of animals, plants, and microorganisms.Gadiformes: An order of fish including the families Gadidae (cods), Macrouridae (grenadiers), and hakes. The large Gadidae family includes cod, haddock, whiting, and pollock.DNA Replication: The process by which a DNA molecule is duplicated.Genomic Instability: An increased tendency of the GENOME to acquire MUTATIONS when various processes involved in maintaining and replicating the genome are dysfunctional.Canada: The largest country in North America, comprising 10 provinces and three territories. Its capital is Ottawa.Anthropology, Physical: The comparative science dealing with the physical characteristics of humans as related to their origin, evolution, and development in the total environment.Mutation: Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.DNA Helicases: Proteins that catalyze the unwinding of duplex DNA during replication by binding cooperatively to single-stranded regions of DNA or to short regions of duplex DNA that are undergoing transient opening. In addition DNA helicases are DNA-dependent ATPases that harness the free energy of ATP hydrolysis to translocate DNA strands.Molecular Sequence Data: Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.Twins: Two individuals derived from two FETUSES that were fertilized at or about the same time, developed in the UTERUS simultaneously, and born to the same mother. Twins are either monozygotic (TWINS, MONOZYGOTIC) or dizygotic (TWINS, DIZYGOTIC).Diseases in Twins: Disorders affecting TWINS, one or both, at any age.Twins, Monozygotic: Two off-spring from the same PREGNANCY. They are from a single fertilized OVUM that split into two EMBRYOS. Such twins are usually genetically identical and of the same sex.Exobiology: The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.Earth (Planet): Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the SOLAR SYSTEM.Evolution, Planetary: Creation and development of bodies within solar systems, includes study of early planetary geology.
Strong metallicity variations are seen across individual galaxies, with M33 and the Milky Way showing higher metallicities ... A primary driver of this difference is the rate of mass loss at different levels of metallicity. Higher metallicity leads to ... Metallicity[edit]. The numbers and properties of Wolf Rayet stars vary with the chemical composition of their progenitor stars ... The more evolved WNE and WC stages are only reached by stars with an initial mass over 25 M☉ at near-solar metallicity, over 60 ...
Metallicity is the abundance of elements other than hydrogen and helium. Note that these 'metals' include elements that are not ... See metallicity below.) Apoapsis is the point of furthest excursion, or separation, between two orbiting objects. Apparent ...
March 2013). "Metallicity of M dwarfs. III. Planet-metallicity and planet-stellar mass correlations of the HARPS GTO M dwarf ...
... its metallicity. A star's metallicity can influence the time the star takes to burn its fuel, and controls the formation of its ... When the metallicity is very low, however, the minimum star size seems to be about 8.3% of the solar mass, or about 87 MJ. ... For stars with metallicity similar to the Sun, the theoretical minimum mass the star can have and still undergo fusion at the ... Older, population II stars have substantially less metallicity than the younger, population I stars due to the composition of ...
With an effective temperature of 5680 K, it is also almost as hot as the Sun, and with a metallicity of 0, Kepler-11 is almost ... Metal-rich stars tend to have easily detectable planets because higher metallicities tend to either facilitate the creation of ... Fischer, Debra A.; Valenti, Jeff (2005-04-01). "The planet-metallicity correlation". The Astrophysical Journal. 622 (2): 1102- ...
Metallicity plays an important role in planetary systems, and stars with higher metallicity are more likely to have planets ... The star's metallicity is 0 (± 0.1), meaning that the level of iron (and, presumably, other elements) in the star is almost the ... This may be because the higher metallicity provides more material with which to quickly build planets into gas giants or ... Fischer, Debra A.; Valenti,Jeff (2005-04-01). "The planet-metallicity correlation". The Astrophysical Journal. 622 (2): 1102- ...
November 2005). "Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the ...
Fischer, Debra A.; Valenti, Jeff (2005). "The Planet‐Metallicity Correlation". The Astrophysical Journal. 622 (2): 1102. ...
It has a low metallicity. V1401 Aquilae was a latter designation of 64 Sagittarii. Samus, N. N.; Durlevich, O. V.; et al. (2009 ...
Gonzalez, G. (1998). The Stellar Metallicity - Planet Connection. Brown dwarfs and extrasolar planets: Proceedings of a ...
The amount of metallicity in a star is given in terms of the ratio of iron (Fe), an easily observed heavy element, to hydrogen ... In the case of Tau Ceti, the atmospheric metallicity is roughly: equivalent to about a third the solar abundance. Past ... doi:10.1046/j.1365-8711.1998.01460.x. Flynn, C.; Morell, O. (1997). "Metallicities and kinematics of G and K dwarfs". Monthly ... General research has shown a positive correlation between the presence of planets and a relatively high-metallicity parent star ...
... which corresponds to a metallicity of 3.54 +0.53 −0.45 times the solar value. This is one of the highest metallicities for any ... and for metallicity-affected parameters if HD 108063 had a solar metallicity. Luminosity class from position on Hertzsprung- ... Determination of the metallicity of HD 108063 has only been made more recently, with the first value made photometrically in ... A metal-rich star has a cooler surface temperature than a lower-metallicity star, with the strength of the effect increasing ...
CIA is also important in low-metallicity brown dwarfs, since "low metallicity" means reduced CNO (and other) elemental ... CIA absorption of H2-X collisional complexes is thus an important diagnostic of high-gravity and low-metallicity brown dwarfs. ... P. Lenzuni; D. F. Chernoff; E. Salpeter (1991). Rosseland and Planck mean opacities of a zero-metallicity gas. Astrophys. J. Th ... D. Saumon; P. Bergeron; J. I. Junine; W. B. Hubbard; A. Burrows (1994). "Cool zero-metallicity stellar atmospheres". ApJ. 424: ...
September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible ... what astronomers term the metallicity. Santos et al. (2004) report the logarithm of the abundance ratio of iron to hydrogen, [ ... Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290-1302, arXiv:1007.2681 , Bibcode:2010ApJ ...
... what astronomers term its metallicity. Relative to the Sun, the abundance of iron in the cluster is given by [Fe/H] = -2.29 dex ...
The star has an iron content (metallicity) of 0 (± 0.1), similar to that of the Sun. Metallicity plays a vital role in the ... Henry Bortman (12 October 2004). "Extrasolar Planets: A Matter of Metallicity". Space Daily. Retrieved 23 March 2011. Vogt, ...
I. Tracers of Metallicity and Extinction". The Astrophysical Journal. 805 (2): 151. arXiv:1504.00011 . Bibcode:2015ApJ...805.. ...
Low metallicity reduces mass loss rates. One effect of this is that Wolf-Rayet stars are uncommon, with a higher proportion of ... The spectral types displayed by low metallicity Wolf-Rayet stars such as those in the SMC are not directly comparable to higher ... 589,000 SMC WR stars have relatively early spectral types for their temperatures, again as a result of the low metallicity. ... Stars in the Small Magellanic Cloud have low metallicity and this affects the process of stellar evolution, especially for ...
Luck, R. Earle; Bond, Howard E. (1989). "Supergiants and the Galactic metallicity gradient. II - Spectroscopic abundances for ...
August 2014), "Metallicity of M dwarfs. IV. A high-precision [Fe/H] and Teff technique from high-resolution optical spectra for ...
I. A metallicity-accretion rate relationship". The Astrophysical Journal. 614: 547-557. Ghisellini, G.; Ceca, R. Della; ...
The system has a low metallicity. Combined with its high galactic latitude, this indicates that the star system has its origin ...
It is also estimated to have a metallicity of [Fe/H] = 0.11 (± 0.03), meaning that Kepler-7 is approximately 30% more metal- ... Henry Bortman (12 October 2004). "Extrasolar Planets: A Matter of Metallicity". Space Daily. Retrieved 27 February 2011. "Notes ... rich than the Sun; metallicity plays a significant role in the formation of planetary systems, as metal-rich stars tend to be ...
The low metallicity of the star at a metallicity (dex) of -0.26, or to put it another way, about half that of the Sun's, is ... The star is slightly cooler than the sun, with roughly half its metallicity. It is known to have five planets, including the ... J. S. Greaves; D. A. Fischer; M. C. Wyatt (November 10, 2005). "Metallicity, debris discs and planets" (PDF). Monthly Notices ...
... has a metallicity of [Fe/H] = -0.055 (± 0.03), making it 12% less metal-rich than the metal-rich Sun; metallicity is ... Henry Bortman (12 October 2004). "Extrasolar Planets: A Matter of Metallicity". Space Daily. Retrieved 27 February 2011. David ...
Caltech, Planet-Metallicity Correlation - The Rich Get Richer, by Ji Wang, Planet-Metallicity Correlation The Planet- ... Metallicity Correlation. 2005, April 200, by Debra A. Fischer, Jeff Valenti arxiv.org, Revealing A Universal Planet-Metallicity ... stars with a higher metallicity than the Sun have a positive logarithmic value, whereas those with a lower metallicity than the ... then compare that value with models to estimate the total metallicity. The overall stellar metallicity is often defined using ...
Deriving the Metallicity distribution function of galactic systems The Metallicity Distribution Function in the disc of the ... The Metallicity distribution function is an important concept in stellar and galactic evolution. It is a curve of what ... The Metallicity Distribution Function and CEMP Fraction". 762 (1): 27. arXiv:1208.3016 . Bibcode:2013ApJ...762...27Y. doi: ... Function of the Halo of the Milky Way The Metallicity Distribution Function of Field Stars in M31s Bulge The Metallicity ...
It is the presence of two valleys in the original system that gives rise to spin-valley half-metallicity. ... has demonstrated a theoretical mechanism for achieving half-metallicity that requires no transition metal atoms. This ... regular and spin-valley half-metallicity - has been made. ...
We present stellar metallicities in Leo I, Leo II, IC 1613, and Phoenix dwarf galaxies derived from medium (F390M) and broad ( ... We measured metallicity distribution functions (MDFs) in two ways, (1) matching stars to isochrones in color-color diagrams and ... For IC 1613 and Phoenix our data do not have the radial extent to confirm a metallicity gradient for either galaxy. We find the ... Ross, T. L., Holtzman, J., Saha, A., & Anthony-Twarog, B. J. (2015). METALLICITY DISTRIBUTION FUNCTIONS OF FOUR LOCAL GROUP ...
... Andersson, Tomas; Zhang, Chaofan; Tchaplyguine, ... Metallicity and plasmons}, url = {http://dx.doi.org/10.1063/1.4718362}, volume = {136}, year = {2012}, } ...
Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). III. Young ...
... the channels of metallicity-sorted metallic single-walled carbon nanotubes (SWCNTs) have been filled with silver chloride. The ... In the present work, the channels of metallicity-sorted metallic single-walled carbon nanotubes (SWCNTs) have been filled with ... This work reveals a direct influence of the incorporated silver chloride on the electronic properties of metallicity-sorted ... Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick ...
I. Metallicity distribution properties Journal Article - in OSTI.gov collection Hou, Jun ; Yu, Qingjuan ; Lu, Youjun, E-mail: ... We find that (1) the slope of the stellar metallicity-stellar mass correlation is sensitive to the SN feedback strength and the ... THE EATING HABITS OF MILKY WAY-MASS HALOS: DESTROYED DWARF SATELLITES AND THE METALLICITY DISTRIBUTION OF ACCRETED STARS ... Title: The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars ...
Factors such as gravity, metallicity and cloud distribution play an important role in the structure and composition of ultra- ... Dissertation: Investigating Brown Dwarf Atmospheres: Gravity, Dust Content, Cloud Structure and Metallicity. September 18, 2017 ...
We observed that the increase in Mn concentration in NiCoMnGa destroys the half metallicity and decreases the total magnetic ... We observed that the increase in Mn concentration in NiCoMnGa destroys the half metallicity and decreases the total magnetic ... M. Singh et al., "Mn-Disorder Effect on Magnetism and Half Metallicity of NiCoMnGa Quaternary Heusler Alloy", Advanced ... Mn-Disorder Effect on Magnetism and Half Metallicity of NiCoMnGa Quaternary Heusler Alloy p.270 ...
Title: Spectrum of the Supernova Relic Neutrino Background and Metallicity Evolution of Galaxies. Authors: Kenichiro Nakazato ... The redshift dependence of the black hole formation rate is considered on the basis of the metallicity evolution of galaxies. ... Assuming the mass and metallicity ranges of failed supernova progenitors, their contribution to SRNs is quantitatively ...
The inferred metallicity is enhanced over that of the host star which is known to be consistent with solar metallicity. Our ... we find that the observed abundances can potentially be explained by a combination of high metallicity (∼10× solar) and ... as compared to equilibrium chemistry with solar metallicity. The concentrations of the species are highly correlated. Our best- ... High Metallicity and Non-Equilibrium Chemistry in the Dayside Atmosphere of Hot-Neptune Gj 436b. *. Nikku Madhusudhan, Susan ...
The influence of metallicity on stellar differential rotation and magnetic activity. AMS Citation:. Karoff, C., and Coauthors, ... The influence of metallicity on stellar differential rotation and magnetic activity. Abstract:. Observations of Sun-like stars ... Here we show for the first time how metallicity can affect a stellar dynamo. Using the most complete set of observations of a ... Therefore, this provides a unique opportunity to study the effect of the higher metallicity on the dynamo acting in this star ...
Strong metallicity variations are seen across individual galaxies, with M33 and the Milky Way showing higher metallicities ... A primary driver of this difference is the rate of mass loss at different levels of metallicity. Higher metallicity leads to ... Metallicity[edit]. The numbers and properties of Wolf Rayet stars vary with the chemical composition of their progenitor stars ... The more evolved WNE and WC stages are only reached by stars with an initial mass over 25 M☉ at near-solar metallicity, over 60 ...
We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an ... We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an ... We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an ... We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. In contrast, an ...
Acquaviva - Measuring metallicity from photometry with machine learning and SED fitting. Speaker. Talk Date. Talk Series. ... Home , Talks , Talks Archive , Acquaviva - Measuring metallicity from photometry with machine learning and SED fitting ...
This involves the concept of metallicity in stars. Stars have a metallicity content. In astrophysics, this means the fraction ... Metallicity and Chemical Makeup. Mass is only part of it. Whats really behind his new classification is the way in which the ... So the first stars had no metallicity, or almost none.. This is an image of M80, an ancient globular cluster of stars. Since ... Our own Sun was formed about 5 billion years ago, and it has the metallicity we expect from a star with its birthdate. Its ...
In this NewsFlash, how induced stem cells help us to understand Alzheimers disease, while embryonic stem cells can help restore patients sight. Plus, why a graphene oxide filter can make self distilling vodka, how magic mushrooms affect the brain, and the magnetic soap that cleans the parts other detergents cant reach!
This week, weve been dreaming of warm sandy beaches while trying to answer this question from Emma and Greig Robinson from New Zealand.Emma - Were looking at the waves on Waikiki Beach in Hawaii at night. Wondering why the breaking waves are white. Where does the white come from? Thank you and we look forward to hearing your answer.
We study classical disk clusters at nearly solar metallicity with ages in the range 200 Myr - 6Gyr using 2MASS photometry and ... We study classical disk clusters at nearly solar metallicity with ages in the range 200 Myr - 6Gyr using 2MASS photometry and ... Theoretical isochrones compared to 2MASS observations : open clusters at nearly solar metallicity. ...
Barnards Star has 10-32% of the solar metallicity.[10] Metallicity is the proportion of stellar mass made up of elements ... While sub-solar, Barnards Stars metallicity is higher than that of a halo star and is in keeping with the low end of the ... Gizis, John E. (1997). "M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale". The Astronomical Journal. 113: ... Gizis, John E. (February 1997). "M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale". The Astronomical Journal ...
metal/metallicity. silver-coloured solid, how sparkly and silvery something appears/ form of music. elements other than those ...
Metallicity. In astronomy and physical cosmology, the metallicity or Z is the fraction of mass of a star or other kind of ... Thus, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. ... This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Metallicity ...
CN-Cycle Solar Neutrinos and Suns Primordial Core Metalicity - Astrophysics. . Biblioteca virtual para leer y descargar libros ... CN-Cycle Solar Neutrinos and Suns Primordial Core Metalicity - Astrophysics - Descarga este documento en PDF. Documentación en ...
3.5 Metallicity.. 3.6 Globular clusters.. 3.7 Hot gas.. 3.8 Dynamics.. 3.9 The Faber-Jackson relation and the fundamental plane ...
  • Metallicity within stars and other astronomical objects is an approximate estimation of their chemical abundances that change over time by the mechanisms of stellar evolution, and therefore provide an indication of their age. (wikipedia.org)
  • The overall stellar metallicity is often defined using the total iron content of the star "[Fe/H]": though iron is not the most abundant heavy element (oxygen is), it is among the easiest to measure with spectral data in the visible spectrum. (wikipedia.org)
  • The Metallicity distribution function is an important concept in stellar and galactic evolution. (wikipedia.org)
  • We present stellar metallicities in Leo I, Leo II, IC 1613, and Phoenix dwarf galaxies derived from medium (F390M) and broad (F555W, F814W) band photometry using the Wide Field Camera 3 instrument on board the Hubble Space Telescope. (ku.edu)
  • Additionally, we measure stellar metallicity gradients in Leo I and II. (ku.edu)
  • Empirical models are employed to relate (peak) subhalo mass to dwarf stellar mass, and we use constraints from z = 0 observations and hydrodynamical simulations to estimate the metallicity distribution of the accreted stellar material. (osti.gov)
  • Karoff, C., and Coauthors, 2018: The influence of metallicity on stellar differential rotation and magnetic activity. (ucar.edu)
  • Here we show for the first time how metallicity can affect a stellar dynamo. (ucar.edu)
  • Using theoretical stellar population synthesis models, we demonstrate that some BATC (Beijing-Arizona-Taiwan-Connecticut Multicolor Sky Survey) colors and color indices can be used to disentangle the age and metallicity effect. (elsevier.com)
  • A dynamical view on stellar metallicity gradient diversity across the Hubble sequence with CALIFA. (u-strasbg.fr)
  • The published metallicity estimates of an open cluster are especially prone to disagreement because each technique has different sensitivities to metallicity patterns, and it is likely that none of the methods commonly used to estimate stellar metallicity, with the possible exception of high-resolution spectroscopy, is measuring the "true" metallicity of the stars. (universetoday.com)
  • The KURUCZ 1993 ATLAS contains about 7600 stellar atmosphere models covering a wide range of metallicities, effective temperatures and gravities. (stsci.edu)
  • Deason, Alis J., Mao, Yao-Yuan, and Wechsler, Risa H.. The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars . (osti.gov)
  • Why is there so much 7 Li on the surface of the 12 low-mass, low-metallicity stars observed in the Milky Way halo by the authors of reference 2, and why is there such a significant discrepancy between the models and the observations? (icr.org)
  • It is believed that older generations of stars generally have lower metallicities than those of younger generations, having been formed in the metal-poor early universe. (wikipedia.org)
  • Observed changes in the chemical abundances of different types of stars, based on the spectral peculiarities that were later attributed to metallicity, led astronomer Walter Baade in 1944 to propose the existence of two different populations of stars. (wikipedia.org)
  • It is a curve of what proportion of stars have a particular metallicity ([Fe/H], the relative abundance of iron and hydrogen) of a population of stars such as in a cluster or galaxy. (wikipedia.org)
  • We measured metallicity distribution functions (MDFs) in two ways, (1) matching stars to isochrones in color-color diagrams and (2) solving for the best linear combination of synthetic populations to match the observed color-color diagram. (ku.edu)
  • stars if their metallicity distributions have significant metal-poor tails. (osti.gov)
  • Three-Dimensional Spectral Classification of Low-Metallicity Stars Usi" by Shawn Snider, Ted von Hippel et al. (erau.edu)
  • We then estimated the effective temperature (T eff ), surface gravity (log g), metallicity ([Fe/H]), and projected rotational velocity (vsin i) of these 34 superflare stars on the basis of our spectroscopic data. (harvard.edu)
  • All stars in an open cluster form at the same time and in the same circumstances and thus are expected to have the same age, metallicity, and galactocentric distance. (universetoday.com)
  • This particular cluster contains a mix of high-metallicity stars doubling as variable stars . (space.com)
  • Before 1982, it was generally believed that Li abundances in "unevolved" low-mass stars 3 with low metallicity 4 were constant as predicted by Big Bang nucleosynthesis models. (icr.org)
  • First, they proposed that the low-mass, low-metallicity stars with excessive 7 Li could be engulfing planets with a high-lithium abundance. (icr.org)
  • However, no model currently exists for how the material from nova explosions could be accreted into the outer layers of main sequence low-mass, low-metallicity stars. (icr.org)
  • Thus, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. (wn.com)
  • Using the transit data, the study team also calculated the " metallicity " of HAT-P-26b's atmosphere - how much of it is made up of elements other than hydrogen and helium. (space.com)
  • For example, Neptune and Uranus both have metallicities about 100 times greater than that of the sun (which is almost entirely hydrogen and helium), whereas the much larger Saturn and Jupiter are just 10 and five times more metallic than the sun, respectively. (space.com)
  • Low metallicity: Astronomers typically call all elements more massive than helium "metals. (icr.org)
  • Assuming the mass and metallicity ranges of failed supernova progenitors, their contribution to SRNs is quantitatively estimated for the first time. (arxiv.org)
  • For example, an observer might measure the oxygen content of a galaxy (for example using the brightness of an oxygen emission line) directly, then compare that value with models to estimate the total metallicity. (wikipedia.org)
  • We find that the metallicity of M81 is about Z = 0.03, with no significant difference over the whole galaxy. (elsevier.com)
  • Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). (stsci.edu)
  • The observations can be explained by the higher metallicity of the star, which is predicted to foster a deeper outer convection zone and a higher facular contrast, resulting in stronger variability. (ucar.edu)
  • The only significant difference between HD 173701 and the Sun is its metallicity, which is twice the solar value. (ucar.edu)
  • M11 has also been studied for its metallicity content, because metallicity estimates will be useful in planning future extrasolar planet transit searches, since planets may form more readily in metal-rich environments. (universetoday.com)
  • Factors such as gravity, metallicity and cloud distribution play an important role in the structure and composition of ultra-cool dwarf atmospheres and ultimately their spectra. (casca.ca)
  • Therefore, this provides a unique opportunity to study the effect of the higher metallicity on the dynamo acting in this star and to obtain a comprehensive understanding of the physical mechanisms responsible for the observed photometric variability. (ucar.edu)
  • Though the exoplanet is about as massive as Neptune, its metallicity is more in line with that of Jupiter , the researchers in the new study found. (space.com)
  • The team of researchers, which included physicists from Russia and Japan, has demonstrated a theoretical mechanism for achieving half-metallicity that requires no transition metal atoms. (mipt.ru)
  • The atlas is divided into 19 independent subdirectories, according to metallicity. (stsci.edu)