RX J0123 .4-7321 --故事还在继续：主要的星周磁盘丢失和恢复
RX J0123.4-7321 -- the story continues: major circumstellar disk loss and recovery
摘要：
RX J0123.4-7321是小麦哲伦星云（SMC）中一个被确认的Be星X射线双星系统（BeXRB）。像许多这样的系统一样，可变的X射线发射是由质量施主Be星的潜在行为驱动的。以前的工作表明，光学和X射线的特点是在拟议的119天的双星周期定期爆发。然而，在2008年2月左右，光学行为发生了实质性的变化，以前有规律的光学爆发结束了。这里报告的是新的光学（OGLE）和X射线（斯威夫特）的观测涵盖了2008年后的时期，这表明一个几乎完全的拱星盘损失，然后逐渐恢复。这表明Be星可能会转变为B星，然后再变回来。然而，在最新的OGLE数据（2020年3月）时，特征性的周期性爆发尚未恢复到早期状态，这表明磁盘仍有一些重建尚未完成。
英文摘要：
RX J0123.4-7321 is a well-established Be star X-ray binary system (BeXRB) in the Small Magellanic Cloud (SMC). Like many such systems the variable X-ray emission is driven by the underlying behaviour of the mass donor Be star. Previous work has shown that the optical and X-ray were characterised by regular outbursts at the proposed binary period of 119 d. However around February 2008 the optical behaviour changed substantially, with the previously regular optical outbursts ending. Reported here are new optical (OGLE) and X-ray (Swift) observations covering the period after 2008 which suggest an almost total circumstellar disc loss followed by a gradual recovery. This indicates the probable transition of a Be star to a B star, and back again. However, at the time of the most recent OGLE data (March 2020) the characteristic periodic outbursts had yet to return to their early state, indicating that the disk still had some re-building yet to complete.
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