A Two-Temperature Supernova Fallback Disk Model for Anomalous X-ray Pulsars

查看全文 作　　者：[1]YeLu;[2]K.S.Cheng 机构地区：[1]NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012;[2]DepartmentofPhysics,UniversityofHongKong,HongKong,China 出　　处：《Chinese Journal of Astronomy and Astrophysics》索引2002年第2卷第2期,共8页 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 10-6-10-5 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. 关 键 词：脉冲星 X射线 不规则性 超新星 模型