Properties of hyperon stars rotating at Keplerian frequency

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

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.

Keywords: equation of state hyperon star moment of inertia redshift

Received: 08 October 2009
Revised: 28 September 2010
Accepted manuscript online:

PACS:	97.10.Kc	(Stellar rotation)
	26.60.+c
	97.60.Jd	(Neutron stars)

Fund: 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).

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Wen De-Hua(文德华) and Chen Wei(陈伟) Properties of hyperon stars rotating at Keplerian frequency 2011 Chin. Phys. B 20 029701

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Properties of hyperon stars rotating at Keplerian frequency

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