Properties of hyperon stars rotating at Keplerian frequency

doi:10.1088/1674-1056/20/2/029701

中国物理B ›› 2011, Vol. 20 ›› Issue (2): 29701-029701.doi: 10.1088/1674-1056/20/2/029701

• • 上一篇

Properties of hyperon stars rotating at Keplerian frequency

陈伟¹, 文德华²

(1)Department of Physics, Jinan University, Guangzhou 510632, China; (2)Department of Physics, South China University of Technology, Guangzhou 510641, China

收稿日期:2009-10-08 修回日期:2010-09-28 出版日期:2011-02-15 发布日期:2011-02-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10947023), and the Fundamental Research Funds for the Central University, China (Grant No. 2009ZM0193).

Properties of hyperon stars rotating at Keplerian frequency

Wen De-Hua(文德华)^a)^† and Chen Wei(陈伟)^b)

^a Department of Physics, South China University of Technology, Guangzhou 510641, China; ^b Department of Physics, Jinan University, Guangzhou 510632, China

Received:2009-10-08 Revised:2010-09-28 Online:2011-02-15 Published:2011-02-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10947023), and the Fundamental Research Funds for the Central University, China (Grant No. 2009ZM0193).

摘要/Abstract

摘要： The structure and properties of a Keplerian rotating hyperon star with an equation of state (EOS) investigated using the relativistic σ--ω--ρ model are examined by employing an accurate numerical scheme. It is shown that there is a clear rotating effect on the structure and properties, and that hyperon star matter cannot support a star with a mass larger than 1.9 M_Θ, even a star rotating at the fastest allowed frequency. The constraints of the two known fastest rotating frequencies (716 Hz and 1122 Hz) on the mass and radius of a hyperon star are also explored. Furthermore, our results indicate that the imprint of the rapid rotation of a hyperon star on the moment of inertia is clear; the backward equatorial redshift, the forward equatorial redshift and the polar redshift can be distinguished clearly, the forward equatorial redshift is always negative; and its figuration is far from a spherical symmetric shape.

关键词: equation of state, hyperon star, moment of inertia, redshift

Abstract: The structure and properties of a Keplerian rotating hyperon star with an equation of state (EOS) investigated using the relativistic $\sigma$-$\omega$-$\rho$ model are examined by employing an accurate numerical scheme. It is shown that there is a clear rotating effect on the structure and properties, and that hyperon star matter cannot support a star with a mass larger than 1.9 M_$\odot$, even a star rotating at the fastest allowed frequency. The constraints of the two known fastest rotating frequencies (716 Hz and 1122 Hz) on the mass and radius of a hyperon star are also explored. Furthermore, our results indicate that the imprint of the rapid rotation of a hyperon star on the moment of inertia is clear; the backward equatorial redshift, the forward equatorial redshift and the polar redshift can be distinguished clearly, the forward equatorial redshift is always negative; and its figuration is far from a spherical symmetric shape.

Key words: equation of state, hyperon star, moment of inertia, redshift

中图分类号: (Stellar rotation)

97.10.Kc

97.60.Jd (Neutron stars)

文德华, 陈伟. Properties of hyperon stars rotating at Keplerian frequency[J]. 中国物理B, 2011, 20(2): 29701-029701.

Wen De-Hua(文德华) and Chen Wei(陈伟) . Properties of hyperon stars rotating at Keplerian frequency[J]. Chin. Phys. B, 2011, 20(2): 29701-029701.

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Properties of hyperon stars rotating at Keplerian frequency

Properties of hyperon stars rotating at Keplerian frequency

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