Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-02
Astron.Lett.30:73-85,2004
Astronomy and Astrophysics
Astrophysics
Astronomy Letters, 2003, vol.29, no.12, in press. 22 pages, including 2 tables, 5 figures
Scientific paper
10.1134/1.1646692
We have considered scenarios for the evolution of close binaries resulting in the formation of semi-detached systems in which a white dwarf can accumulate Chandrasekhar mass by accretion from a main-sequence or subgiant companion with $M\sim 2 M_\odot$. These white dwarfs, probably, explode as type Ia supernovae or collapse with formation of neutron stars. We have carried out a population synthesis study for these systems and have estimated the occurrence rate of such events in the Galaxy, depending on the parameter of common envelopes, mass-exchange rate in the binary, reaction of the main-sequence component on accretion of helium in the intervening phase of evolution. We have found that the model occurrence rate of SNe Ia in semi-detached systems is $\simeq 0.2 \times 10^{-3}$ yr$^{-1}$, i. e., it does not exceed $\sim 10%$ of the observational estimate of the Galactic occurrence rate of SNe Ia.
Fedorova Alexandra V.
Tutukov Aleksandr V.
Yungelson Lev R.
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