Effects of a New Triple-α Reaction Rate on the Helium Ignition of Accreting White Dwarfs
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概要
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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.
- 2010-11-25
著者
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SARUWATARI Motoaki
Department of Physics, Kyushu University
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HASHIMOTO Masa-aki
Department of Physics, Kyushu University
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Saruwatari Motoaki
Department Of Physics Kyushu University
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Hashimoto Masa-aki
Department Of Physics Kyushu University
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Hashimoto Masa-aki
Department Of Earth Science And Astronomy College Of Arts And Sciences University Of Tokyo
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