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arXiv 0812.1034astro-ph
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瞬变低质量X射线双星EXO0748-676的日食计时。IV。罗西X射线计时探测器

Eclipse Timings of the Transient Low Mass X-ray Binary EXO0748-676. IV. The Rossi X-Ray Timing Explorer Eclipses

Michael T. Wolff, Paul S. Ray, Kent S. Wood, Paul L. Hertz

摘要:

我们报告我们的完整数据库的X射线日食的时间的低质量X射线二进制EXO 0748 -676观测的罗西X射线定时探测器(RXTE)卫星。在撰写本文时,我们已经积累了443次完整的X射线日食,其中392次是用RXTE上的正比计数器阵列观测到的。这些包括日食被专门针对的观测和在RXTE数据档案中发现的日食。自1985年2月发现EXO 0748 -676系统以来,一直保持Eclipse循环计数。我们描述了我们对每个日食的观测和分析技术,并描述了自Wolff等人(2002)上次编译以来我们所做的改进。本文的主要结果是数据库包含的定时结果从一个七参数拟合的X射线光变曲线的每个观测到的日食以及相关的误差拟合参数。根据标准的O-C分析,EXO 0748 -676自发现以来经历了四个不同的轨道周期。此外,EXO 0748 -676在O-C曲线中显示了小规模的事件,可能是由于二级恒星的短暂变化。

英文摘要:

We report our complete database of X-ray eclipse timings of the low mass X-ray binary EXO0748-676 observed by the Rossi X-Ray Timing Explorer (RXTE) satellite. As of this writing we have accumulated 443 full X-ray eclipses, 392 of which have been observed with the Proportional Counter Array on RXTE. These include both observations where an eclipse was specifically targeted and those eclipses found in the RXTE data archive. Eclipse cycle count has been maintained since the discovery of the EXO0748-676 system in February 1985. We describe our observing and analysis techniques for each eclipse and describe improvements we have made since the last compilation by Wolff et al. (2002). The principal result of this paper is the database containing the timing results from a seven-parameter fit to the X-ray light curve for each observed eclipse along with the associated errors in the fitted parameters. Based on the standard O-C analysis, EXO0748-676 has undergone four distinct orbital period epochs since its discovery. In addition, EXO0748-676 shows small-scale events in the O-C curve that are likely due to short-lived changes in the secondary star.

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