천문학논총 (Publications of The Korean Astronomical Society)

  • 제30권2호
  • /
  • Pages.585-586
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  • 2015
  • /
  • 1225-1534(pISSN)
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  • 2287-6936(eISSN)
한국천문학회 (The Korean Astronomical Society)
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THE UPDATED ORBITAL PERIOD OF LOW MASS X-ray BINARY 4U 1323-62

  • CHUANG, PO-SHENG (Graduate Institute of Astromony, National Central University) ;
  • CHOU, YI (Graduate Institute of Astromony, National Central University) ;
  • HU, CHIN-PING (Graduate Institute of Astromony, National Central University) ;
  • YANG, TING-CHANG (Graduate Institute of Astromony, National Central University) ;
  • SU, YI-HAO (Graduate Institute of Astromony, National Central University) ;
  • LIAO, NAI-HUI (Graduate Institute of Astromony, National Central University) ;
  • HSIEH, HUNG-EN (Graduate Institute of Astromony, National Central University) ;
  • LIN, CHING-PING (Graduate Institute of Astromony, National Central University)
  • 투고 : 2014.11.30
  • 심사 : 2015.06.30
  • 발행 : 2015.09.30
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초록

4U 1323-62, a low mass X-ray binary with an orbital period of 2.94 hr, exhibits periodic X-ray dips, which are due to absorption by the bulge of the outer accretion disk. The purpose of this study is to search for orbital period changes using archived X-ray data over a time span of 20 years. We present our preliminary results from analyzing light curves observed by RXTE, BeppoSAX, XMM-Newton and Suzaku. We used the method proposed by Hu et al. (2008) to estimate dip center time and adopted the Observed - Calculated method to measure changes in period. We obtained an orbital period of 2.941917(36) hr and a period derivative of $\dot{P}_{orb}/P_{orb}=(-9.9{\pm}3.5){\times}10^{-7}yr^{-1}$. The F-test result shows that the quadratic ephemeris is describes the evolution of the dip phases better than the linear ephemeris at a greater than 95% confidence level. More X-ray data collected from the early 80s will be included to further refine the orbital ephemeris.

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참고문헌

  1. Balucinska-Church, M., Church, M. J., & Oosterbroek, T., et al., 1999, An X-ray Study of the Dipping Low Mass X-ray Binary XV 1323-619, Apj, 349, 495
  2. Chou, Y., Grindlay, J. E., & Bloser, P. F., 2001, Timing Analysis of the Light Curve of the Dipping-Bursting X-Ray Binary X1916-053, ApJ, 549, 1135 https://doi.org/10.1086/319443
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  4. Hu, C.-P., Chou, Y. & Chung, Y.-Y., 2008, A Parameterization Study of the Properties of the X-Ray Dips in the Low-Mass X-Ray Binary X1916-053, Apj, 680, 1405 https://doi.org/10.1086/527549
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