Helium in stellar atmospheres |
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| Authors: | L S Lyubimkov |
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| Institution: | 1.Crimean Astrophysical Observatory Research Institute,Nauchnyi,Crimea, Ukraine |
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| Abstract: | Helium, which was first discovered on the sun with the help of spectral analysis, plays, together with hydrogen, a principal
role in astrophysics. We consider here two fundamental quantities: primordial helium abundance formed during Big Bang nucleosynthesis
and the current initial helium abundances in nearby stars. It is shown that stellar atmospheres are enriched in helium during
the main-sequence stage. Observational evidence for helium contamination in close OB-binaries is discussed. Stars with strong
abundance anomalies are considered, such as chemically peculiar Ap and Bp helium-deficient stars and some types of objects
with helium atmospheres. |
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