Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..903t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 4, p. 903-907.
Astronomy and Astrophysics
Astronomy
26
Radio Stars, Stellar Flares, Very Long Base Interferometry, Binary Stars, Radio Emission
Scientific paper
In 1991 July, we studied a strong radio flare in the RS CVn system HR 1099 with VLBI techniques. This system is one in a list of stars which we regularly monitor with the Noto 32-m antenna at 6 cm. The angular size of the radio source was found to increase at the beginning of the flare. It reached about 4 mas, which corresponds to a linear size comparable to that of the entire binary system. An upper limit of 80 G for the magnetic field was derived. The flare decay reflects the change of the power spectrum of the emitting electrons towards lower energies, due to radiative losses and interaction with the local plasma.
Migenes Victor
Trigilio Corrado
Umana Grazia
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