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EUV Emission from RS CVn binaries
C.K. Mitrou, M. Mathioudakis, J.G. Doyle and E. Antonopoulou
A&A, in press
We performed a study of 104 RS CVn systems in the extreme ultraviolet (EUV)
using the all--sky survey data obtained by the Extreme Ultraviolet Explorer
(EUVE). The present sample includes several new RS CVn detections; 11 more
than in the published EUVE catalogs, and 8 more than in the ROSAT Wide
Field Camera catalog. The ratio of detections to non--detections remained con­
stant throughout the sky, implying that our detections are not limited by the
exposure time but are most likely limited by absorption from the interstellar
medium. A general trend of increasing Lex/B (50--180A) flux with decreasing
rotational period is clear. The dwarf systems exhibit a leveling­off for the faster
rotators. In contrast, the evolved systems exhibit no such effect. For the RS
CVn systems the losses in the EUV represent a smaller fraction of the coronal
radiative losses, as compared to active late--type dwarfs.
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