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- W33678189 abstract "Abstract. We performed a study of 104 RS CVn systems inthe extreme ultraviolet (EUV) using the all–sky survey dataobtained by the Extreme Ultraviolet Explorer (EUVE). Thepresent sample includes several new RS CVn detections; 11more than in the published EUVE catalogs, and 8 more thanin the ROSAT Wide Field Camera catalog. The ratio of detec-tions to non–detections remained constant throughout the sky,implying that our detections are not limited by the exposuretime but are most likely limited by absorption from the inter-stellarmedium.AgeneraltrendofincreasingLex/B(50–180A)˚flux with decreasing rotational period is clear. The dwarf sys-temsexhibitaleveling-offforthefasterrotators.Incontrast,theevolvedsystemsexhibitnosucheffect.FortheRSCVnsystemsthelossesintheEUVrepresentasmallerfractionofthecoronalradiative losses, as compared to active late–type dwarfs.Key words: binaries: close – ultraviole: stars – stars: coronal –stars: activity1. IntroductionTheRSCanumVenaticorumbinariestypicallyconsistofalate–type(GorK)chromosphericallyactiveandusuallyevolvedstar,forced into faster rotation than its age and evolutionary statusimplies by the presence of a companion which may (or maynot) be active as well. The phenomena associated with thesestars originate from high magnetic activity due to very activedynamosoperatingasaresultofdeepconvectivezonesandfastrotation. The study of this activity in the UV, EUV and X–raypart of the spectrum has become possible with the launch ofthe IUE, and subsequently EXOSAT, Einstein, HST, ROSAT,andEUVEsatellites.TheRSCVnsystemsoccupyaprominentposition among the late–type stars insofar as they exhibit thehighestluminositiesintheX–raypartofthespectrum(Dempsey" @default.
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- W33678189 date "1997-02-01" @default.
- W33678189 modified "2023-10-03" @default.
- W33678189 title "EUV Emission from RS Canum Venaticorum binaries." @default.
- W33678189 hasPublicationYear "1997" @default.
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