VLBI observations of YZ CMi - a single dMe star.
Abstract
The quiescent (nonflaring) radio emission of the single dMe star YZ CMi was detected in an intercontinental VLBI experiment at 1.7 GHz. A radio diameter of the star of 1.0 + or - 0.5 mas was found, statistically compatible with zero. The formal value corresponds to 1.7 optical stellar diameters and yields a brightness temperature of 1.7 x 10 exp 9 K with a lower limit of 4 x 10 exp 8 K. This high brightness strongly suggests emission by nonthermal particles by the gyrosynchrotron mechanism or an incoherent process.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1991
- Bibcode:
- 1991A&A...252L..19B
- Keywords:
-
- Brightness Temperature;
- Radio Emission;
- Stellar Coronas;
- Stellar Radiation;
- Very Long Base Interferometry;
- Gyrofrequency;
- Late Stars;
- Thermal Emission;
- Astrophysics