Hyperon Effects on the Spin Parameter of Rotating Neutron Stars
QI Bin1 , ZHANG Nai-Bo1 , WANG Shou-Yu1 , SUN Bao-Yuan2,3**
1 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 2642092 School of Nuclear Science and Technology, Lanzhou University, Lanzhou 7300003 Key Laboratory of Special Function Materials and Structure Design of Ministry of Education, Lanzhou 730000
Abstract ：Based on the equations of state from the relativistic mean field theory without and with the inclusion of strangeness-bearing hyperons, we study the dimensionless spin parameter j =cJ /(GM 2 ) of uniformly rotating neutron stars. It is shown that the maximum value of the spin parameter j max of a neutron star rotating at the Keplerian frequency fK is j max ～0.7 when the star mass M >0.5 M? , which is sustained for various versions of equations of state without and with hyperons. The relationship between j and the scaled rotation frequency f /fK is found to be insensitive to the star mass or the adopted equation of state in the models without hyperons. However, the emergence of hyperons in neutron stars will lead to an uncertainty of the spin parameter j , which in turn could generate a complexity in the theoretical study of the quasi-periodic oscillations observed in disk-accreting compact-star systems.
收稿日期: 2015-08-14
出版日期: 2015-12-01
:
21.30.Fe
(Forces in hadronic systems and effective interactions)
21.60.Jz
(Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations))
26.60.-c
(Nuclear matter aspects of neutron stars)
97.60.Jd
(Neutron stars)
[1] Backer D C, Kulkarni S R, Heiles C et al 1982 Nature 300 615 2006 Science 311 1901 2007 Astrophys. J. Lett. 657 L97 2003 Living Rev. Relativ. 6 3 1994 Astrophys. J. 424 823 1997 Astrophys. J. 488 799 2009 Astron. Astrophys. 502 605 2011 Astrophys. J. 728 12 1998 Astrophys. J. 508 791 2007 Phys. Rep. 442 109 2015 Phys. Rev. D 92 023007 1974 Ann. Phys. (N. Y.) 83 491 Adv. Nucl. Phys. 16 12006 Prog. Part. Nucl. Phys. 57 470 Compact Stars, Nuclear Physics, ParticlePhysics and General Relativity 2nd edn (New York: Springer-Verlag)2001 Phys. Rev. C 64 025804 2004 Phys. Rev. C 69 045805 1979 Phys. Lett. B 86 146 1995 Nucl. Phys. A 581 725 2008 Phys. Rev. C 78 065805 2010 Chin. Phys. Lett. 27 099701 2012 Chin. Phys. Lett. 29 059701 2013 Chin. Phys. Lett. 30 092101 2013 Chin. Phys. Lett. 30 129501 2015 Chin. Phys. Lett. 32 059701 1994 Prog. Theor. Phys. 92 803 1985 Astrophys. J. 293 470 1996 Phys. Rev. C 53 1416 2012 Phys. Rev. C 85 025806 1997 Phys. Rep. 280 1 2011 Chin. Phys. Lett. 28 089701 2013 Int. J. Mod. Phys. E 22 1350085 1998 Astron. Astrophys. Suppl. Ser. 132 431 1995 Astrophys. J. 444 306 1999 Nucl. Phys. A 656 331 2004 Phys. Rev. C 69 034319 2005 Phys. Rev. C 71 024312 1974 Phys. Rev. D 9 1613
[1]
.
[2]
.
[3]
.
[4]
.
[5]
.
[6]
.
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2015, Vol. 32 
