首页 | 本学科首页   官方微博 | 高级检索  
     


Energy release on the surface of a rapidly rotating neutron star during disk accretion: A thermodynamic approach
Authors:N. R. Sibgatullin  R. A. Sunyaev
Affiliation:(1) Moscow State University Vorob’evy gory, Moscow, 119899, Russia;(2) Max-Planck-Institut fuer Astrophysik, Karl Schwarzschild Strasse 1, 86740 Garching bei Muenchen, Germany;(3) Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117810, Russia
Abstract:The total energy E of a star as a function of its angular momentum J and mass M in the Newtonian theory, E=E(J, M) [in general relativity, the gravitational mass of a star as a function of its angular momentum J and rest mass m, M=M(J, m)], is used to determine the remaining parameters (angular velocity, chemical potential, etc.) in the case of rigid rotation. Expressions are derived for the energy release during accretion onto a cool (with constant entropy), rapidly rotating neutron star (NS) in the Newtonian theory and in general relativity. A separate analysis is performed for the cases where the NS equatorial radius is larger and smaller than the radius of the marginally stable orbit in the disk plane. An approximate formula is proposed for the NS equatorial radius for an arbitrary equation of state, which matches the exact equation of state at J=0.
Keywords:neutron stars  luminosity  disk accretion  X-ray bursters
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号