Photospheric convection zones and evolution of subluminous OB-stars

Details Photospheric convection zones and evolution of subluminous OB-stars Photospheric convection zones and evolution of subluminous OB-stars

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..107g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 1, Nov. 1985, p. 107-116.

Astronomy and Astrophysics

Astrophysics

62

B Stars, Convection, O Stars, Photosphere, Stellar Atmospheres, Stellar Evolution, Abundance, Atmospheric Models, Dwarf Stars, Helium, Nonequilibrium Thermodynamics

Scientific paper

Singly and doubly ionized helium convection zones occurring in the photospheres of subluminous O-stars are studied in detail. Since it is known that NLTE effects dominate the temperature and ionization stratification, this done on the basis of NLTE model atmospheres. The intent is to investigate whether convection impedes gravitational settling of helium in the case of the intermediate helium-rich subdwarfs and whether the absence of such objects for effective temperatures below 40,000 K on a plot of log g vs T-sub-eff can be explained by the absence of convection zones working against diffusion.

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