Mathematics – Probability
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372...23p&link_type=abstract
15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in
Mathematics
Probability
Scientific paper
It has been shown quite recently with high probability tep{p10_MO} that all subdwarf B (sdB) stars, extreme horizontal branch (EHB) objects, belong to binary systems. Assuming that the progenitors of EHB objects belong to the binaries with initial separations of roughly a hundred solar radii and fill in their critical Roche lobes when being close to the tip of the red giant branch, we have found earlier ( teauthor{p10_PP} teyear{p10_PP}) that considerable shrinkage of the orbit can be achieved due to a combined effect of angular momentum loss from the red giant and appreciable on its low mass companion on the hydrodynamical timescale of the donor resulting in formation of helium WD with masses roughly equal to half a solar mass and thus evading the common envelope stage. Here we briefly discuss the outcome of evolution of orbit in terms of hydrodynamical time scale and the time scale of angular momentum loss.
Pustylnik Izold
Pustynski Vladislav
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