A coordinated radio and Hα survey of southern RS CVn systems and related objects

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Abstract
We present the results of a search for radio emission at 5 GHz from a selection of 21 southern hemisphere RS CVn binaries and related late-type emission-line stars. Three of the program stars were detected above the survey limit of 10 mJy, including the previously known RS CVn radio binary HR 1099 and two new radio binaries, HR 4492 (= HD 101379) and HD 195040. A simultaneous program of high-resolution Ha spectroscopy revealed significant emission profile variability in both the latter stars. Radio variability on time-scales of ~ 1 day was observed in both HR 1099 and 4492. An increase by a factor of 3 in the observed radio flux density from HR 4492 on 1981 July 18 was accompanied by a significant enhancement of the Ha equivalent width by ~ 0.5 Å on that date.

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