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Astron. Astrophys. 333, 970-976 (1998)

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Radio flares from the active binary system UX Arietis

G. Torricelli-Ciamponi 1, E. Franciosini 2, M. Massi 3, 4 and J. Neidhöfer 4

1 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
2 Dipartimento di Astronomia e Scienza dello Spazio, Largo E. Fermi 5, I-50125 Firenze, Italy
3 Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, Dwingeloo, The Netherlands
4 Max-Planck-Institute für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Received 8 December 1996 / Accepted 22 December 1997

Abstract

In this paper the flaring activity of the active binary system UX Arietis is investigated by analysing some radio spectra acquired by the Effelsberg 100-m radiotelescope. These spectra are characterized by positive spectral indexes, and show the evolution of the emission during the flare rising phases. The usual interpretation in terms of gyrosynchrotron emission from relativistic electrons trapped in a bipolar magnetic field and undergoing collisional and radiative losses does not fit these data. For this reason a continuous injection of accelerated particles has been included in the model. The computed spectra evolve in time in agreement with available observations.

Key words: binaries: close – stars: flare – stars: individual: UX Ari – radio continuum: stars

Send offprint requests to: G. Torricelli

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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