POSTER PAPER 7.08
A Simultaneous H Alpha and Radio Flare on the RS CVn System UX Ari
Catalano, S., Umana, G., Cafra, B., Frasca, A., Trigilio, C., Marilli, E.
Institute: Osservatorio Astrofisico di Catania, Italy
Institute: Istituto di Radioastronomia, C.N.R, Italy
Institute: Dipartimento di Fisica e Astronomia, Universita di Catania, Italy
Contact Email: scatalano@ct.astro.it
Abstract:
We report the results of coordinated H alpha and radio observations of the
RS CVn binary UX Ari. Spectrographic H alpha 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 H alpha 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.
Index Keywords: UX Ari
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Manuscript submitted: 2001-Sep-06
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.