1 RXS J171824 .2-402934的监测活动，具有最低质量吸积率的低质量X射线双星
Monitoring campaign of 1RXS J171824.2-402934, the low-mass X-ray binary with the lowest mass accretion rate
摘要：
钱德拉和斯威夫特的一项X射线监测活动证实，1 RXS J171824.2-402934在已知的持续吸积的低质量X射线双星中以最低的速度吸积。RXTE上的全天监测器探测到了一次热核X射线爆发。这是在1 RXS J171824.2-402934中发现的第二次这样的爆发，在19年多的20多毫秒的观测中。爆发复发率低与吸积率低是一致的。如果双星系统是超紧的，那么在吸积盘理论中，持久性和低吸积率是可以调和的。这意味着轨道周期将空前短，不到约7分钟。超紧凑的性质，加上I型X射线爆发的性质，反过来又表明富氦物质是吸积的。钱德拉误差区的光学跟踪并没有揭示出一个明确的对应物。
英文摘要：
An X-ray monitoring campaign with Chandra and Swift confirms that 1RXS J171824.2-402934 is accreting at the lowest rate among the known persistently accreting low-mass X-ray binaries. A thermonuclear X-ray burst was detected with the all-sky monitor on RXTE. This is only the second such burst seen in 1RXS J171824.2-402934 in more than 20 Ms of observations done over 19 years. The low burst recurrence rate is in line with the low accretion rate. The persistent nature and low accretion rate can be reconciled within accretion disk theory if the binary system is ultracompact. An unprecedentedly short orbital period of less than approximately 7 minutes would be implied. An ultracompact nature, together with the properties of the type I X-ray burst, suggests, in turn, that helium-rich material is accreted. Optical follow-up of the Chandra error region does not reveal an unambiguous counterpart.
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