Another faint ultraviolet object associated with a globular cluster X-ray source: The case of M92

The core of the metal-poor galactic globular cluster M92 (NGC 6341) has bee n observed with Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space T elescope through visual, blue, and mid-UV filters in a program devoted to s tudying the evolved stellar population in a selected sample of galactic glo bular 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 err or box of a low-luminosity globular cluster X-ray source (LLGCX) recently f ound in the core of M92. The properties of the UV star discovered in M92 ar e very similar to those of other UV stars found in the core of some cluster s (M13, 47 Tuc, M80, etc.)-all of them are brighter in the UV than in the v isible and are located in the vicinity of a LLGCX. We suggest that these st ars are a new subclass of cataclysmic variables.