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Saio, H.; Nomoto, K.

Astronomy and Astrophysics (1985), 150(1), L21-L23 CODEN: AAEJAF; ISSN: 0004-6361. English.

The evolution was studied 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 .times. 10-5 M.sum.-yr-1. Such a rapid accretion ignites an off-center C flash. The C 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 C deflagration, but a collapse triggered by e captures on 24Mg and 20Ne to form a single n star. This class of n star might be an origin of a single millisecond pulsar.