Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123...33l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 33-38.
Astronomy and Astrophysics
Astrophysics
45
Binary Stars, Stellar Mass Accretion, Variable Stars, White Dwarf Stars, X Ray Sources, Helium, Stellar Evolution
Scientific paper
The authors investigate whether a significant fraction of the observed high-mass white dwarfs in cataclysmic binaries can be formed via a Case BB mass transfer. For this they explore the consequences of a Case BB evolution, where the first (Case B) mass transfer results in a highly non-conservative evolution involving a common-envelope phase and the formation of a very close binary with a helium star primary as an intermediate product. They find that in this case, the second (Case BB) mass transfer from the helium star probably induces a second spiraling-in phase with the subsequent ejection of the helium-rich common envelope. CO-white dwarfs with masses up to the Chandrasekhar mass can be formed if the first mass transfer results in a very short-period binary. Furthermore the authors discuss whether the formation of O-Ne-Mg-white dwarfs, which can also result from a Case BB evolution, is of any observable consequences. They also discuss briefly the origin of the low-mass X-ray binaries.
Law Y. W.
Ritter Hans
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