| A Two—Temperature Supernova Fallback Disk Model for Anomalous X—ray Pulsars |
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| 作者姓名： | Ye Lu and K. S. Cheng National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Ye Lu and K. S. Cheng National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 Department of Physics，University of Hong Kong，Hong Kong，China |
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| 基金项目： | 香港大学校科研和教改项目 |
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| 摘 要： | We present a case study of the relevance of the radially pulsational instability of a two-temperature accretion disk around a neutron star to anomalous X-ray pulsars (AXPs). Our estimates are based on the approximation that such a neutron star disk with mass in the range of 10^-6-10^-5M⊙ is formed by supernova fallback. We derive several peculiar properties of the accretion disk instability: a narrow interval of X-ray pulse periods; lower X-ray luminosities; a period derivative and an evolution time scale. All these results are in good agreement with the observations of the AXPs.
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| 关 键 词： | 脉冲星 X射线 不规则性 超新星 模型 |
A Two-Temperature Supernova Fallback Disk Model for Anomalous X-ray Pulsars |
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| Ye Lu and K. S. Cheng National Astronomical Observatories,Chinese Academy of Sciences,Beijing .A Two-Temperature Supernova Fallback Disk Model for Anomalous X-ray Pulsars[J].Chinese Journal of Astronomy and Astrophysics,2002,2(2):161-168. |
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| Authors: | YE Lu KSCheng |
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| Institution: | [1]NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012 [2]DepartmentofPhysics,UniversityofHongKong,HongKong,China |
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| Abstract: | We present a case study of the relevance of the radially pulsational instability of a two-temperature accretion disk around a neutron star to anomalous X-ray pulsars (AXPs). Our estimates are based on the approximation that such a neutron star disk with mass in the range of 10-6 - 10-5 M⊙ is formed by supernova fallback. We derive several peculiar properties of the accretion disk instability: a narrow interval of X-ray pulse periods; lower X-ray luminosities; a period derivative and an evolution time scale. All these results are in good agreement with the observations of the AXPs. |
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| Keywords: | pulsars: general - pulsars - stars: neutron - X-rays: stars -accretion disk - instability |
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