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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Abstract

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
Volume126
Issue number6
DOIs
Publication statusPublished - Dec 1 2011

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Matsuo, Y., Tsujimoto, H., Noda, T., Saruwatari, M., Ono, M., Hashimoto, M. A., & Fujimoto, M. Y. (2011). Effects of a new triple-α reaction on x-ray bursts of a helium-accreting neutron star. Progress of Theoretical Physics, 126(6), 1177-1186. https://doi.org/10.1143/PTP.126.1177