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

Abstract

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.

21 pages, 4 figures. Astrophysical journal in press

References in corpus (2)

• The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features
• Blue Straggler Stars: The Spectacular Population in M80

Cited by in corpus (7)

• Relativistic Binaries in Globular Clusters
• Blue Stragglers, Young White Dwarfs and UV-excess stars in the core of 47 Tuc
• A census with ROSAT of low-luminosity X-ray sources in globular clusters
• A Keck/DEIMOS spectroscopic survey of the faint M31 satellites And IX, And XI, And XII, and And XIII
• Study of HST counterparts to Chandra X-ray sources in the Globular Cluster M71
• Relativistic Binaries in Globular Clusters
• Near-Infrared Photometry of Four Stellar Clusters in the Small Magellanic Cloud