Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...211l...5g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 211, no. 1, Feb. 1989, p. L5-L8. Research supported by the Swiss Academy of Sc
Astronomy and Astrophysics
Astrophysics
29
Flare Stars, Radio Stars, Red Dwarf Stars, Stellar Spectra, Cyclotron Radiation, Optical Thickness, Spectral Bands, Stellar Magnetic Fields, Synchrotron Radiation, Very Large Array (Vla)
Scientific paper
The dMe star UV Ceti was observed at the VLA in all available frequency bands (90, 20, 6, 3.6, 2, and 1.3 cm) on two dates separated by about one week. Beside confirming former reports about quiescent emission at 6 and at 20 cm, nonflaring radio emission has also been discovered at all smaller wavelengths. The radio spectra show a minimum or break at the 3.6 cm band. The radio spectra show a minimum or break at the 3.6 cm band. This behavior is unexpected if the low-frequency emission is synchrotron radiation, as generally believed. It may be interpreted as a different emission increasing to millimetric waves from the well known microwave component. The high frequency component is shown to be compatible with cyclotron radiation of the X-ray emitting plasma. The new component then would require magnetic fields in the source varying from at least 600 up to 2070 Gauss. This suggests nu(B)/nu(p) = 1...10 in the corona of UV Ceti.
Benz Arnold O.
Guedel Manuel
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