Oscillating URCA process in mass-accreting white dwarfs

Details Oscillating URCA process in mass-accreting white dwarfs Oscillating URCA process in mass-accreting white dwarfs

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..446a&link_type=abstract

Astronomy and Astrophysics, Vol. 272, p. 446 (1993)

Astronomy and Astrophysics

Astrophysics

3

Stars: Binaries: Close, Stars: Evolution, Stars: Interiors, Stars: Oscillations, Stars: Supernovae: General, Stars: White Dwarfs

Scientific paper

In this paper we study under which conditions the oscillating Urca process can be relevant for the evolution of mass-accreting white dwarfs. We have found that, if the oscillation amplitude is large enough, which corresponds to high accretion rates, it can trigger the ignition of carbon at a lower density than presently thought, at ρ = l.l7 109 g cm-3, thus producing less neutronized chemical species than common models of type Ia supernovae. If the oscillation amplitude is small, which corresponds to low accretion rates, carbon can be ignited non-explosively and induce the non-explosive collapse of the white dwarf to a neutron star. We also discuss how the oscillation can appear.

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