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)
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