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Prog. Theor. Phys. Vol. 124 No. 5 (2010) pp. 925-929

[ Full Text PDF : FREE ACCESS (169K) ]

Letters

Effects of a New Triple-α Reaction Rate on the Helium Ignition of Accreting White Dwarfs

Motoaki Saruwatari1,* and Masa-aki Hashimoto1,**

1Department of Physics, Kyushu University, Fukuoka 812-8581, Japan

(Received April 6, 2010; Revised August 9, 2010)

Abstract:

The effects of a new triple-α reaction rate on the ignition of carbon-oxygen white dwarfs accreting helium in a binary system have been investigated. The ignition points determine the properties of a thermonuclear explosion of a Type Ia 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 [K. Nomoto, Astrophys. J. 253 (1982), 798]. 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 lower accretion rate than dM/dt ≃4 ×10-8 M⊙ yr-1 which has been believed to be 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 rates disappears.

Subject Index : 242, 421
URL : http://ptp.ipap.jp/link?PTP/124/925/
DOI : 10.1143/PTP.124.925


* E-mail: saruwatari@phys.kyushu-u.ac.jp
** E-mail: hashimoto@phys.kyushu-u.ac.jp

[ Full Text PDF : FREE ACCESS (169K) ] Citation:

References:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 126 No. 6 (2011) pp. 1177-1186 :
    Effects of a New Triple-α Reaction on X-Ray Bursts of a Helium-Accreting Neutron Star
    Yasuhide Matsuo, Hideyuki Tsujimoto, Tsuneo Noda, Motoaki Saruwatari, Masaomi Ono, Masa-aki Hashimoto and Masayuki Y. Fujimoto

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