Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12.1014t&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
Ar Lacertae, Vla, Vlba
Scientific paper
A multiwavelength observing campaign on the binary system AR Lacertae was performed over a time interval of four days. During this period the source showed a main flare event, followed by an enanched but decreasing flux level. The five-frequencies VLA and the simultaneous high spatial resolution VLBA data at two frequencies allow us to study the evolution of the structure of the radio emitting regions and of the spectra during the flare, as well as outside the flare event. During the quiescence, the negative spectral index indicates that the radio source is optically thin. As the flare starts, the spectra becomes quite flat, suggesting that the source cannot be associated to a single homogeneous region, but to a complex coronal structure. The double source revealed by the analysis of the VLBA data confirms the enhanced complexity of the emitting region during the flare.
Buemi Carla Simona
Leto Paolo
Pagano Isabella
Rodono' Marcello
Trigilio A.
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