Results 1 to 10 of about 876,778 (355)
Solar and stellar photospheric abundances [PDF]
Living Reviews in Solar Physics, 2016 The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations.
Carlos Allende Prieto
doaj +6 more sources
Stellar abundances of beryllium and CUBES [PDF]
Astrophysics and Space Science, 2014 Stellar abundances of beryllium are useful in different areas of astrophysics, including studies of the Galactic chemical evolution, of stellar evolution, and of the formation of globular clusters.
R. Smiljanic
semanticscholar +7 more sources
Stellar Iron Abundances at the Galactic Center [PDF]
The Astrophysical Journal, 2000 We present measurements of [Fe/H] for six M supergiant stars and three giant stars within 0.5 pc of the Galactic Center (GC) and one M supergiant star within 30 pc of the GC. The results are based on high-resolution (lambda / Delta lambda =40,000) K-band spectra, taken with CSHELL at the NASA Infrared Telescope Facility.We determine the iron abundance ...
Solange RamÃrez +6 more
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The Galactic Thick Disk Stellar Abundances [PDF]
The Astronomical Journal, 2000 We present first results from a program to measure the chemical abundances of a large (N > 30) sample of thick disk stars with the principal goal of investigating the formation history of the Galactic thick disk.
J. X. Prochaska +4 more
semanticscholar +7 more sources
Abundance of Helium in Stellar Atmospheres [PDF]
Highlights of Astronomy, 1971 Helium abundance in stellar atmospheres has been the subject of several recent investigations, essentially induced by progresses in the computation of non-grey model atmospheres (including line blanketing in the far U.V.), by considerable advances in the theory of Stark broadening of helium lines, by non local thermodynamic equilibrium (LTE) work for ...
R. Cayrel
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Accuracy and Precision of Industrial Stellar Abundances [PDF]
Annual Review of Astronomy and Astrophysics, 2018 There has been an incredibly large investment in obtaining high-resolution stellar spectra for determining chemical abundances of stars. This information is crucial to answer fundamental questions in astronomy by constraining the formation and evolution ...
P. Jofr'e, U. Heiter, C. Soubiran
semanticscholar +6 more sources
Uncertainties in stellar abundance analyses [PDF]
Highlights of Astronomy, 2003 AbstractOver the last half-century quantitative stellar spectroscopy has made great progress. However, most stellar abundance analyses today still employ rather simplified models, which can introduce severe systematic errors swamping the observational errors.
M. Asplund
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Metal Abundances of Young Stellar Groups [PDF]
Symposium - International Astronomical Union, 1980 The metal abundances of young stellar groups in the solar vicinity are obtained from the photometric [Fe/H] ratios observed for the red giant group members. The definition of the groups has been rediscussed with the help of a sample of B5-A0 stars whose physical properties are derived by Cramer (1979).
M. Grenon
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Physical Input for the Determination of Stellar Abundances [PDF]
Symposium - International Astronomical Union, 1988 The fundamental parameters and the physical modelling and data used in the analysis of high-resolution high S/N spectra of stars are discussed. Particular emphasis is led on recent developments in these respects and the importance of further improvements is stressed.
B. Gustafsson
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Stellar photospheric abundances as a probe of discs and planets [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Protoplanetary disks, debris disks, and disrupted or evaporating planets can all feed accretion onto stars. The photospheric abundances of such stars may then reveal the composition of the accreted material.
A. Jermyn, M. Kama
semanticscholar +4 more sources