The discovery of the cataclysmic binary RX J191059.6+285639 is a curious coincidence - it required the star to lie close to a brighter, as yet unidentified, X-ray source. The limited variability information available and the optical spectrum at minimum light both suggest that it is a dwarf nova, and probably not a magnetic system. A longer-term variability study is needed to classify it firmly.
Of the dwarf novae listed in Ritter & Kolb (1998) as having periods long-ward of the to h `gap', only BX Pup appears to have a well-established period shorter than the 3.43 h period of RX J191059.6+285639. Thus this accidental little star may yet find fame as one of the the shortest-period dwarf novae long-ward of the gap.
© European Southern Observatory (ESO) 2000
Online publication: June 8, 2000