A Probable Dwarf Nova Outburst in the Core of the Globular Cluster M22
A Probable Dwarf Nova Outburst in the Core of the Globular Cluster M22
复制标题
球状星团 M22 核心可能发生矮新星爆发
DOI：
10.1086/379922
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
I. King
中科院分区：
文献类型：
--
作者：
Jay Anderson;A. Cool;I. King
我们重新研究了Sahu等人先前报道的一个事件，它是M22的一颗星星对一颗银河核球星星的微透镜效应。我们找到了强有力的证据，证明这一事件实际上是星团中一个激变变星的矮新星爆发。主要证据包括星星的自行、Hα发射、X射线光度和静止时亮度的变化。这颗星星位于星团核心，但可以从地面监测未来的爆发，以确认其性质。这是在球状星团中发现的极少数被证实或可能的矮新星爆发之一，也是第一次在如此低浓度的星团中发现。
We reexamine an event that was previously reported by Sahu et al. as a microlensing event of a Galactic bulge star by a star of M22. We find strong evidence that the event was actually a dwarf nova outburst of a cataclysmic variable in the cluster. The primary evidence consists of the star's proper motion, Hα emission, X-ray luminosity, and variable brightness in quiescence. The star is in the cluster core but can be monitored from the ground for future outbursts to confirm its nature. This is one of a very small number of confirmed or probable dwarf nova eruptions seen in globular clusters and the first to be found in such a low-concentration cluster.