考虑非牛顿引力下的快速转动混合星性质  

Properties of rapidly rotating hybrid stars with non-Newtonian gravity

作　　者：付宏洋[1] 文德华[1] 燕晶[1] 

机构地区：[1]华南理工大学物理系,广州510641

出　　处：《物理学报》2012年第20期577-582,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10947023;11275073);中央高校基本科研业务费(批准号:2012ZZ0079);教育部留学回国人员科研启动基金资助的课题~~

摘　　要：计算和讨论了考虑非牛顿引力下的快速转动混合星结构与性质,包括质量-半径关系、Kepler转速、转动惯量、引力红移以及转动动能和引力结合能之比等.结果表明,转动将有效地增大混合星能支持的最大质量,Kepler转速下能支持的最大质量比静态时增加20%左右;转动对于考虑非牛顿引力的混合星整体结构性质(包括质量-半径关系、转动惯量、转动动能和引力结合能之比等)具有明显的影响,但对极向引力红移影响相对较小.The properties of rapidly rotating hybrid stars are calculated and discussed with an equation of state considering non-Newtonian gravity （described by the Yukawa contribution）. The said properties include the mass-radius relationship, the Kepler rotating frequency, the moment of inertia, the gravitational redshifl and the ratio of the rotational energy to the gravitational energy. It is shown that at the Kepler frequency, the maximum stellar mass increases up to about 20% compared with that from the static model at the same central density. It is also shown that for a rapidly rotating hybrid star, the rotation has an obvious influence on the bulk properties, such as the mass-radius relationship, the moment of inertia, the ratio of the rotational energy and gravitational energy, but has a faint effect on the polar gravitational redshift.

关 键 词：混合星 开普勒转速 非牛顿引力 

分 类 号：P145.6[天文地球—天体物理]