RZ Gru - a UX UMa 'disc star'.
Stickland, D. J.; Kilkenny, D.; Kelly, B. D.; Cooke, J. A.; Coulson, I.; Engelbrecht, C.; Spencer-Jones, J.
United Kingdom, South Africa
Abstract
The star RZ Gruis is confirmed as a cataclysmic variable. Its ultraviolet spectrum suggests that it belongs to the UX UMa subclass in which an optically thick disc is maintained at outburst state; coordinated optical and UV photometry show changes of about one magnitude on a time-scale of months in addition to smaller variations on a scale of minutes, but not the major outbursts of the dwarf novae.