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, Masayuki Y. Fujimoto

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11 Citations (Scopus)


The effects of a new triple-a 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 -10M ⊙yr -1 to 3 × 10 -8M ⊙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- 8M ⊙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.

Original languageEnglish
Pages (from-to)1177-1186
Number of pages10
JournalProgress of Theoretical Physics
Issue number6
Publication statusPublished - Dec 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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