Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007arep...51..291t&link_type=abstract
Astronomy Reports, Volume 51, Issue 4, pp.291-307
Astronomy and Astrophysics
Astronomy
12
97.10.Cv, 97.30.Qt, 97.60.Bw, 97.80.Fk, 97.80.Jp
Scientific paper
We consider the evolution of close binaries resulting in the most intensive explosive phenomena in the stellar Universe—Type Ia supernovae and gamma-ray bursts. For Type Ia supernovae, which represent thermonuclear explosions of carbon-oxygen dwarfs whose masses reach the Chandrasekhar limit during the accretion of matter from the donor star, we derive the conditions for the accumulation of the limiting mass by the degenerate dwarf in the close binary. Accretion onto the degenerate dwarf can be accompanied by supersoft X-ray radiation with luminosity 1-104 L &sun;. Gamma-ray bursts are believe to accompany the formation and rapid evolution of compact accretion-decretion disks during the formation of relativistic objects—black holes and neutron stars. The rapid (˜1 M &sun;/ s) accretion of matter from these disks onto the central compact relativistic star results in an energy release of ˜0.1 M &sun; c 2 ˜ 1053 erg in the form of gamma-rays and neutrinos over a time of 0.1-1000 s. Such disks can form via the collapse of the rapidly rotating cores of Type Ib, Ic supernovae, which are components in extremely close binaries, or alternately due to the collapse of accreting oxygen-neon degenerate dwarfs with the Chandrasekhar mass into neutron stars, or the merging of neutron stars with neutron stars or black holes in close binaries. We present numerical models of the evolution of some close binaries that result in Type Ia supernovae, and also estimate the rates of these supernovae (˜0.003/year) and of gamma-ray bursts (˜10-4/year) in our Galaxy for various evolutionary scenarios. The collimation of the gamma-ray burst radiation within an opening angle of several degrees “matches” the latter estimate with the observed rate of these events, ˜10-7-10-8/year calculated for a galaxy with the mass of our Galaxy.
Fedorova Alexandra V.
Tutukov Aleksandr V.
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