Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..254k&link_type=abstract
Astronomy and Astrophysics, vol. 106, no. 2, Feb. 1982, p. 254-260.
Astronomy and Astrophysics
Astrophysics
47
Eclipsing Binary Stars, O Stars, Stellar Spectra, Stellar Spectrophotometry, Subdwarf Stars, Ultraviolet Spectroscopy, Abundance, Helium Ions, Light Curve, Spectrum Analysis, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Mass Accretion, Stellar Mass Ejection, Stellar Models, Thermodynamic Equilibrium
Scientific paper
A non-LTE analysis is presented for the primary component of the sdO eclipsing binary LB 3459. The results of the analysis give Teff = 40,000+3000-2000 K, log g = 5.3±O.2 (cgs) and a surprisingly low helium abundance of y = 0.3+O.2-0.1% by numbers. LB 3459 appears to be the result of mass exchange during the first giant phase. The primary most likely has a mass of 0.3 Msun and consists of a hydrogen shell and degenerate helium core. Diffusion is suggested as the cause of helium depletion in the photosphere. The secondary has a mass of 0.04 Msun and a radius of 0.09 Rsun, which is close to a degenerate configuration of solar composition.
Hill Philip W.
Kilkenny Dave
Kudritzki Rolf Peter
Lynas-Gray Anthony E.
Simon K. P.
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