Impacts of a Newly Calculated 3α Reaction Rate on the Helium Accreting White Dwarfs

Details Impacts of a Newly Calculated 3α Reaction Rate on the Helium Accreting White Dwarfs Impacts of a Newly Calculated 3α Reaction Rate on the Helium Accreting White Dwarfs

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1269..412s&link_type=abstract

THE 10TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: OMEG-2010. AIP Conference Proceedings, Volume 1

Computer Science

1

Accretion Disks, White Dwarfs, Supernovae, Neutron Stars, Infall, Accretion, And Accretion Disks, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Supernovae, Neutron Stars

Scientific paper

Effects of a new triple-α reaction rate on the ignition of carbon-oxygen white dwarfs accreting helium in a binary systems have been investigated. The ignition points determine the properties of a thermonuclear explosion of a Type la supernova. We examine the cases of different accretion rates of helium and different initial masses of the white dwarf, which was studied in detail by Nomoto[4]. We find that for all cases from slow to intermediate accretion rates, nuclear burnings are ignited at the helium layers. As a consequence, carbon deflagration would be triggered for the lower accretion rate compared to that of dM/dt~=4×1O-8 Msolar yr-1 which has been believed to the lower limit of the accretion rate for the deflagration supernova. Furthermore, off-center helium detonation should result for intermediate and slow accretion rates and the region of carbon deflagration for slow accretion rate is disappeared.

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