Another Faint UV Object Associated with a Globular Cluster X-Ray Source: The Case of M92

Details Another Faint UV Object Associated with a Globular Cluster X-Ray Source: The Case of M92 Another Faint UV Object Associated with a Globular Cluster X-Ray Source: The Case of M92

2000-03-15

arxiv.org/abs/astro-ph/0003217v1

Astronomy and Astrophysics

Astrophysics

21 pages, 4 figures. Astrophysical journal in press

Scientific paper

10.1086/309034

The core of the metal poor Galactic Globular Cluster M92 (NGC 6341) has been observed with WFPC2 on the Hubble Space Telescope through visual, blue and mid-UV filters in a program devoted to study the evolved stellar population in a selected sample of Galactic Globular Clusters. In the UV $(m_{255}, m_{255}-U)$ color magnitude diagram we have discovered a faint `UV-dominant' object. This star lies within the error box of a Low Luminosity Globular Cluster X-ray source (LLGCX) recently found in the core of M92. The properties of the UV star discovered in M92 are very similar to those of other UV stars found in the core of some clusters (M13, 47 Tuc, M80, etc)---all of them are brighter in the UV than in the visible and are located in the vicinity of a LLGCX. We suggest that these stars are a new sub-class of cataclysmic variables.

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