The Radio Corona of AR Lacertae

Details The Radio Corona of AR Lacertae The Radio Corona of AR Lacertae

2001-04-23

arxiv.org/abs/astro-ph/0104376v1

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures. Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20010566

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 Rodono` et al. (1999). Our VLBA data indicate a resolved source with dimension close to the system separation, while the study of the flux density curve evidences 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 thermal gyrosynchrotron is responsible for the radio emission, but it is compatible with the hypothesis of co-spatial X-ray and radio emitting sources.

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