Constraints on kilohertz quasi-periodic oscillation models and stellar equations of state from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	Constraints on kilohertz quasi-periodic oscillation models and stellar equations of state from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30
	Wang, DH; Chen, L; Zhang, CM; Lei, YJ; Qu, JL;屈进禄
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013
卷号	435 期号:4 页码:3494-3499
关键词	accretion accretion discs binaries: close stars: neutron X-rays: stars
英文摘要	We test the relativistic precession model (RPM) and the magnetohydrodynamics Alfven wave oscillation model (AWOM) for the kilohertz (kHz) quasi-periodic oscillations (QPOs) from sources with measured neutron star (NS) masses and twin kHz QPO frequencies. For the RPM, the derived NS masses of Cyg X-2, SAX J1808.4-3658 and 4U 1820-30 are 1.96 +/- 0.10, 2.83 +/- 0.04 and 1.85 +/- 0.02 M-circle dot, respectively. These are, respectively, similar to 30, 100 and 40 per cent higher than the measured results 1.5 +/- 0.3, < 1.4 and 1.29(-0.07)(+0.19) M-circle dot. For the AWOM, where the free parameter of the model is the density of the star, we infer the NS radii to be around 10-20 km for the above three sources. Based on this, we can infer the matter compositions inside the NSs with the help of the equations of state. In particular, for SAX J1808.4-3658, the AWOM shows a lower mass density for its NS than those of the other known kHz QPO sources, with a radius range of 17-20 km, which excludes the strange quark matter inside its star.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000325774700058
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224231]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Wang, DH,Chen, L,Zhang, CM,et al. Constraints on kilohertz quasi-periodic oscillation models and stellar equations of state from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,435(4):3494-3499.
APA	Wang, DH,Chen, L,Zhang, CM,Lei, YJ,&Qu, JL；屈进禄.(2013).Constraints on kilohertz quasi-periodic oscillation models and stellar equations of state from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,435(4),3494-3499.
MLA	Wang, DH,et al."Constraints on kilohertz quasi-periodic oscillation models and stellar equations of state from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 435.4(2013):3494-3499.