Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150l..21s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 150, no. 1, Sept. 1985, p. L21-L23. Sponsorship: Ministry of Education, Scienc
Astronomy and Astrophysics
Astrophysics
126
Binary Stars, Carbon Stars, Mass Transfer, Neutron Stars, Stellar Evolution, White Dwarf Stars, Gravitational Collapse, Oxygen, Pulsars, Stellar Mass Accretion, Stellar Mass Ejection, Stellar Models
Scientific paper
The authors investigate the evolution of a merging pair of C+O white dwarfs which constitutes a close binary system. The merging process is simulated as a rapid mass transfer from a less massive white dwarf to a more massive one at a rate of 1×10-5M_sun;yr-1. Such a rapid accretion ignites an off-center carbon flash. The authors found that the carbon burning front propagates inward all the way through the central region and hence the CO white dwarf is completely changed into an ONeMg white dwarf in a quiescent manner. Therefore, the ultimate outcome of the system will not be a type I supernova explosion induced by the carbon deflagration but a collapse triggered by electron captures on 24Mg and 20Ne to form a single neutron star. This class of neutron star might be an origin of a single millisecond pulsar.
Nomoto Ken
Saio Hideyuki
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