VLBI observations of YZ CMi - A single dMe star

Details VLBI observations of YZ CMi - A single dMe star VLBI observations of YZ CMi - A single dMe star

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252l..19b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. L19-L22.

Astronomy and Astrophysics

Astrophysics

23

Brightness Temperature, Radio Emission, Stellar Coronas, Stellar Radiation, Very Long Base Interferometry, Gyrofrequency, Late Stars, Thermal Emission

Scientific paper

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.

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