S 10943 Vulpeculae: A New ROSAT Selected Dwarf Nova, probably of SU Ursae Majoris Subclass

Abstract

We have identified the ROSAT all-sky survey source RX J1953.1+2115 with a newly discovered dwarf novae (named S 10943 Vulpeculae) with a recurrence time of 83.6 days. With the expected period of ~2.8 hrs (based on the measured superhump period of 2.871 hrs) S 10943 Vul would be the SU Ursae Majoris star with the second largest superhump (and orbital) period known (together with TU Men).

to appear in Inf. Bull. Var. Stars 4622 (1998); also available from http://www.obs.aip.de/~jcg/publis.html