Hot stars and cosmic abundances
| Autor: | Norbert Przybilla, Andreas Irrgang, Keith Butler, M.-F. Nieva |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Physics
COSMIC cancer database Microphysics General Engineering Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Spectral line Parsec Stars Space and Planetary Science Homogeneous Abundance (ecology) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Statistical physics Chemical composition Astrophysics::Galaxy Astrophysics |
| Zdroj: | EAS Publications Series. 63:13-23 |
| ISSN: | 1638-1963 1633-4760 |
| DOI: | 10.1051/eas/1363002 |
| Popis: | Hot massive stars are ideal indicators for present-day cosmic abundances. We review results from a non-LTE study of a larger sample of early B-type stars in the solar neighbourhood by Nieva & Przybilla (2012) and extend the analysis. Using comprehensive models with improved microphysics, novel analysis methodologies and high-quality spectra it is shown that the present-day chemical composition in massive stars out to several hundred parsec distance from the Sun is highly homogeneous. Abundances for about a dozen astrophysically important chemical elements are presented, including new preliminary data on aluminium, sulphur and argon. This establishes a cosmic abundance standard, which serves as a reference facilitating chemical peculiarities in other stars to be identified. Similarities and differences to the solar standard, and implications are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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