A key factor to the spin parameter of uniformly rotating compact stars: crust structure
A key factor to the spin parameter of uniformly rotating compact stars: crust structure
复制标题
均匀旋转致密星自旋参数的关键因素：地壳结构
DOI：
10.1088/1674-4527/16/4/060
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发表时间：
2016
影响因子：
1.8
通讯作者：
Gao Jian-Hua
中科院分区：
文献类型：
--
作者：
Qi Bin;Zhang Nai-Bo;Sun Bao-Yuan;Wang Shou-Yu;Gao Jian-Hua
基于相对论平均场理论和麻省理工学院袋模型，研究了包括传统中子星、高离子中子星和混合星在内的不同类型均匀旋转致密星的无量纲自旋参数j≡CJ/(GM2)。结果表明，传统中子星中提出的jmax∼0.7对于M>；0.5M⊙的超音子中子星和混合星是持续的.确定三种致密恒星jmax的关键因素不是恒星内部，而是恒星的地壳结构。此外，还提出了一个普适公式j=0.6 3(f/fK)−0.42(f/fK)2+0.48(f/fK)3来确定任意自旋频率f小于开氏频率fK时的自旋参数。
We study the dimensionless spin parameter j≡ cJ/(GM 2) of different kinds of uniformly rotating compact stars, including traditional neutron stars, hyperonic neutron stars and hybrid stars, based on relativistic mean field theory and the MIT bag model. It is found that j max∼ 0.7, which had been suggested in traditional neutron stars, is sustained for hyperonic neutron stars and hybrid stars with M> 0.5 M⊙. Not the interior but rather the crust structure of the stars is a key factor to determine j max for three kinds of selected compact stars. Furthermore, a universal formula j= 0.63 (f/f K)− 0.42 (f/f K) 2+ 0.48 (f/f K) 3 is suggested to determine the spin parameter at any rotational frequency f smaller than the Keplerian frequency f K.