Temporal Behaviour of Sources in the ROSAT Extreme Ultraviolet All-Sky Survey

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Scientific paper

During the ROSAT all-sky survey (1990 July - 1991 January), each source detected by the extreme-ultraviolet (EUV) Wide Field Camera (WFC) was observed once per ~1.5 h, for typically five days, dictated by the characteristics of the scanning survey. Light-curves for each of the 479 sources in the WFC 2RE Catalogue have been generated and tested for constancy on time-scales ~1.5 h. As a result, 31 sources have been classified as variable. The main constituents of the 2RE Catalogue are, in order, late-type. stars (F-M), hot white-dwarf stars, and cataclysmic variables. CVs are found to be the most active group with ~50 per cent of them displaying variability, compared with ~10 per cent of late-type stars. All the variable G-type stars are known or possible RS CVn-type binaries; ~40 per cent of the 2RE G-type RS CVn systems are found to vary. Other variable sources are the high-mass X-ray binary Her X-1, the eclipsing binaries Algol (B8 V + K0 IV) and V471 Tau (DA + K2 V), and the active galaxy Mrk 478.

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