Volume 373, Number 1, July I 2001
|Page(s)||181 - 189|
|Section||Interstellar and circumstellar matter|
|Published online||15 July 2001|
The radio corona of AR Lacertae
Istituto di Radioastronomia del C.N.R., Stazione VLBI di Noto, CP 141 Noto, Italy
2 Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
3 Dipartimento di Fisica e Astronomia, Università di Catania, Via S. Sofia 78, 95123 Catania, Italy
4 Owens Valley Radio Observatory, California Institute of Technology, Big Pine, CA 93513, USA
Corresponding author: C. Trigilio, email@example.com
Accepted: 12 April 2001
We present multifrequency VLA and VLBA observations at 8.4 GHz of the RS CVn system AR Lac, that were performed in autumn 1997 simultaneously with X-ray observations obtained from Rodonò et al. ([CITE]). Our VLBA data indicate a resolved source with dimension close to the system separation, while the study of the flux density curve reveals a small amplitude outside of the eclipse variability. The derived five-frequencies spectra, combined with the size information from VLBA data, are compared with gyrosynchrotron emission from a two component structured source. A comparison with the results of the X-ray observations allow us to exclude the possibility that a thermal gyrosynchrotron is responsible for the radio emission, but it is compatible with the hypothesis of co-spatial X-ray and radio emitting sources.
Key words: stars: coronae / radio continuum: stars / stars: binaries: close / stars: individual: AR Lac / stars: binaries: general / techniques: interferometric
© ESO, 2001
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