The possible effect of diffusion in helium-rich subdwarf O stars

Details The possible effect of diffusion in helium-rich subdwarf O stars The possible effect of diffusion in helium-rich subdwarf O stars

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..251u&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 251-254 (2010).

Computer Science

Stellar Evolution, Convection, Stellar Atmospheres, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Thermodynamic Processes, Conduction, Convection, Equations Of State, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation

Scientific paper

The effect of a thin surface convection zone due to the partial ionization of helium on the results of diffusion calculations for helium-rich subdwarf O stars is discussed for the stellar parameters Teff = 40000 K, logg = 6.0 and M*0.5 Msolar. An initial composition according to a late hot-flasher scenario has been assumed. It is shown that a carbon-enriched stellar atmosphere may be transformed into a carbon-poor one, if the mass of the surface layer mixed due to the convection zone is of the order 10-11 M*. The abundance of nitrogen is reduced by about a factor of three only in this case.

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