A Simultaneous Hα and Radio Flare on the RS CVn System UX Ari

Details A Simultaneous Hα and Radio Flare on the RS CVn System UX Ari A Simultaneous Hα and Radio Flare on the RS CVn System UX Ari

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..981c&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

Ux Ari

Scientific paper

We report the results of coordinated Hα and radio observations of the RS CVn binary UX Ari. Spectrographic Hα observations were carried out at the M.G. Fracastoro Station of Catania Astrophysical Observatory (Mt. Etna), while the radio (5 GHz) observations were obtained by using the 32m radio telescope at the Noto VLBI Station of Institute of Radioastronomy of C.N.R., in October 2000. The decay phase of a giant flare was followed in both bands. On our knowledge, this is the first time that a simultaneous Hα and radio flare was observed in UX Ari. The onset of the flare and the whole light-curve in the radio could be established by combining the Noto data with Green Bank monitoring program data, estimating a total duration of the flaring period, at least, of 16 days.
The chromospheric and coronal energy budget is also estimated and typical spatial scale, magnetic field strength and plasma parameters are discussed.

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