| A Study on the Correlations between the Twin kHz QPO Frequencies in Sco X-1 |
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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 Institute of High Energy Physics Chinese Academy of Sciences Beijing |
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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 and Fan Zhang National Astronomical Observatories,Chinese Academy of Sciences,Beijing Institute of High Energy Physics,Chinese Academy of Sciences,Beijing .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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| Institution: | [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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