Chemical abundances in early B-type stars. IV - He, CNO, and SI abundances

Details Chemical abundances in early B-type stars. IV - He, CNO, and SI abundances Chemical abundances in early B-type stars. IV - He, CNO, and SI abundances

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..171k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 171-187.

Astronomy and Astrophysics

Astrophysics

164

B Stars, Cyano Compounds, Helium, Silicon, Stellar Composition, Stellar Spectra, Abundance, Chemical Composition, Interstellar Matter

Scientific paper

Chemical abundances of 21 unevolved B-stars in the local field and nearby associations are given. LTE model atmospheres and non-LTE line formation calculations were used for the abundance determination of He, C, N, O, and Si. A comparison with evolutionary tracks from Maeder & Meynet (1988) shows that all stars are near the main sequence. In the atmospheres of two stars processed matter has been detected, which can be explained by the assumption of fast rotation. Differences in the observed abundances lead to the conclusion that the interstellar matter is well mixed on a large scale but inhomogeneous on a small scale.

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