Non-LTE analysis of the SdO star BD+75 deg 325

Details Non-LTE analysis of the SdO star BD+75 deg 325 Non-LTE analysis of the SdO star BD+75 deg 325

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..307k&link_type=abstract

The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited

Astronomy and Astrophysics

Astronomy

16

Iue, O Stars, Stellar Atmospheres, Stellar Temperature, Ultraviolet Astronomy, Emission Spectra, Helium Ions, Hydrogen Ions, Radiative Transfer, Stellar Evolution, Thermodynamic Equilibrium

Scientific paper

Effective temperature, gravity and helium abundance were determined by a NLTE analysis of high resolution International Ultraviolet Explorer spectra and visual coude spectra. The results are: Teff = 55,000 K + or - 2500 K, log g = 5.3 + or - 0.3 (CGS), N (HE)/(N (H) + N (HE)) = 0.6 - 0.10 + 0.15. The evolutionary status of BD + 75 deg 325, as well as of other SdO stars, is discussed by comparing the positions in the Teff plane with evolutionary tracks computed for stars with similar H-He mixtures.

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