The Accreting White Dwarf in the Close Binary EUVE J1016-053

摘要

The hot white dwarf in the close binary EUVE J1016-053 (=RE 1016-053) has been classified as a DAO white dwarf; its mixed H/He composition has been attributed to steady accretion from the close red dwarf companion. We have obtained extreme-ultraviolet (EUV) photometric and spectroscopic observations of EUVE J1016-053 with the Extreme Ultraviolet Explorer (EUVE). We report the discovery of a ≈30/100 EUV flux variation over a period of 57.3 minutes, which we attribute to surface abundance inhomogeneities modulated over the stellar rotation period, Prot.