Effects of a New Triple-α Reaction on X-Ray Bursts of a Helium-Accreting Neutron Star
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概要
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The effects of a new triple-α reaction (OKK) rate on a helium flash of a helium-accreting neutron star in a binary system have been investigated. Since ignition points determine the properties of a thermonuclear flash of type I X-ray bursts, we examine the cases of different accretion rates, dM/dt (M), of helium from 3×10^<-10>M_&xosot; yr^<-1> to 3×10^<-8>M_&xosot; yr^<-1>, which could cover the observed accretion rates. We find that, at low accretion rates, nuclear burning occurs at the helium layers of rather low densities. As a consequence, helium deflagration would be triggered at accretion rate lower than M≃3×10^<-8>M_&xosot; yr^<-1>. We find that the OKK rate is consistent with the available observations of X-ray bursts on a helium-accreting neutron star. We advocate that the OKK rate is better than the previous rate for the astrophysical phenomena of X-ray burst due to helium accretion.
- 2011-12-25
著者
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SARUWATARI Motoaki
Department of Physics, Kyushu University
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Fujimoto Masayuki
Department Of Cosmosciences Graduate School Of Science Hokkaido University
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Saruwatari Motoaki
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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Hashimoto Masa-aki
Department Of Physics Faculty Of Science Kyusyu University
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Ono Masaomi
Department Of Physics Kyushu University
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Noda Tsuneo
Department Of Obstetrics And Gynecology Higashi-osaka Central Hospital
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Matsuo Yasuhide
Department Of Physics Kyushu University
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Fujimoto Masayuki
Department Of Physics Hokkaido University
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TSUJIMOTO Hideyuki
Department of Physics, Kyushu University
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Tsujimoto Hideyuki
Department Of Physics Kyushu University
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FUJIMOTO Masayuki
Department of Physics, Hokkaido University
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ONO Masaomi
Yukawa Institute for Theoretical Physics, Kyoto University:Department of Physics, Kyushu University
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