CNO abundances in the peculiar BN0.5Ia binary HD 163181

Details CNO abundances in the peculiar BN0.5Ia binary HD 163181 CNO abundances in the peculiar BN0.5Ia binary HD 163181

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..537k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Feb. 1981, p. 537-546. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

15

Abundance, Binary Stars, Carbon Stars, Nitrogen, Oxygen, Supergiant Stars, Thermodynamic Equilibrium, Stellar Evolution, Stellar Temperature

Scientific paper

LTE and non-LTE abundance analyses are presented for the peculiar binary BN0.5Ia supergiant, HD 163181 (V453 Sco), relative to two normal supergiants HD 154090 (B0.7Ia) and kappa Ori (B0.5Ia). The latter two stars have normal compositions for early-type stars, while HD 163181 is overabundant in nitrogen by a factor between 2(non-LTE) and 4(LTE), and underabundant in carbon and oxygen (LTE) by a factor of approximately 5. Discussion of mass loss rates and comparison with theoretical evolutionary tracks indicates that at least 50 percent of the star's original mass has been lost by stellar wind and binary mass transfer. The observed composition is compatible with the theoretical predictions for stars stripped to their convective cores.

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