Constraints on kilohertz quasi-periodic oscillation models and stellar equations of state from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30
文献类型：期刊论文
| 作者 | Wang, D. H.1,2; Chen, L.1; Zhang, C. M.2; Lei, Y. J.2; Qu, J. L.3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-11-01 |
| 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000325774700058 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5696]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 2.Univ Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, D. H.,Chen, L.,Zhang, C. M.,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, D. H.,Chen, L.,Zhang, C. M.,Lei, Y. J.,&Qu, J. L..(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, D. H.,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. |
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来源：国家天文台
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