| A Study on the Correlations between the Twin kHz QPO Frequencies in Sco X-1 |
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| 引用本文： | Hong-Xing Yin,Cheng-Min Zhang,Yong-Heng Zhao,Li-Ming Song and Fan Zhang National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012 Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039. A Study on the Correlations between the Twin kHz QPO Frequencies in Sco X-1[J]. 中国天文和天体物理学报, 2005, 5(6): 595-600 |
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| 作者姓名： | Hong-Xing Yin Cheng-Min Zhang Yong-Heng Zhao Li-Ming Song and Fan Zhang National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100039 |
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| 作者单位： | Hong-Xing Yin，Cheng-Min Zhang，Yong-Heng Zhao，Li-Ming Song and Fan Zhang National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 Institute of High Energy Physics，Chinese Academy of Sciences，Beijing 100039 |
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| 摘 要： | For the bright neutron star low-mass X-ray binary Sco X-1, we analyzed all updated frequencies of the twin kilohertz quasi-periodic oscillations (kHz QPOs), their correlations and distributions. We found that the frequency separation of the kHz QPO peaks appears not to be a constant, rather, it decreases with increasing inferred mass accretion rate. We show that the currently available data of Sco X-1 by Rossi X-ray Timing Explorer are inconsistent with the proposals of the beat model that the frequency separation is a constant. Our conclusions are consistent with those of some previous researchers and we discuss further implications for the kilohertz QPO models.
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| 关 键 词： | X光线 天体 中子 天文物理 |
A Study on the Correlations between the Twin kHz QPO Frequencies in Sco X-1 |
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| Hong-Xing Yin Cheng-Min Zhang Yong-Heng Zhao Li-Ming Song Fan Zhang. A Study on the Correlations between the Twin kHz QPO Frequencies in Sco X-1[J]. Chinese Journal of Astronomy and Astrophysics, 2005, 5(6): 595-600 |
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| Authors: | Hong-Xing Yin Cheng-Min Zhang Yong-Heng Zhao Li-Ming Song Fan Zhang |
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| Affiliation: | [1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 [2]Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039 |
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| Abstract: | For the bright neutron star low-mass X-ray binary Sco X-1, we analyzed all updated frequencies of the twin kilohertz quasi-periodic oscillations (kHz QPOs), their correlations and distributions. We found that the frequency separation of the kHz QPO peaks appears not to be a constant, rather, it decreases with increasing inferred mass accretion rate. We show that the currently available data of Sco X-1 by Rossi X-ray Timing Explorer are inconsistent with the proposals of the beat model that the frequency separation is a constant. Our conclusions are consistent with those of some previous researchers and we discuss further implications for the kilohertz QPO models. |
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| Keywords: | X-rays: accretion disks- stars: neutron- X-rays: stars |
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