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Strong radio flaring period in UX Arietis
P. Leto and
Received 20 June 1995 / Accepted 24 October 1997
In January 1993 we observed the RS CVn-type binary system UX Ari at 6 cm using the 32 m radiotelescope of Noto, with a temporal coverage of about 12 hours per day. The source was found to be in a very active period, with a continuous series of radio flares of flux densities up to 350 mJy. The analysis of the data shows that the radio emission consists of two different components: a continuous series of strong radio flares and an orbital phase dependent component, with a minimum of emission around phase .
The amplitude of the radio flares and their time of occurrence do not depend on the orbital phase, suggesting that the region where they originate is always visible from Earth.
A bright and stable active region, localized in the hemisphere of the K star not visible from the G star, seems to account for the orbital phase dependence of the radio emission.
Key words: binaries: close stars: coronae stars: flare stars: individual: UX Ari radio continuum: stars
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© European Southern Observatory (ESO) 1998
Online publication: January 27, 1998