VLBI observations of single main-sequence M stars.

Details VLBI observations of single main-sequence M stars. VLBI observations of single main-sequence M stars.

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...298..187b&link_type=abstract

Astronomy and Astrophysics, v.298, p.187

Astronomy and Astrophysics

Astrophysics

19

Stars: Coronae, Stars: Flare, Stars: Late Type, Radio Continuum: Stars, Techniques: Interferometric

Scientific paper

Single dMe stars have been observed at 18cm wavelength by intercontinental very long baseline interferometry (VLBI). Here we report on two stars, EQ Peg B and AD Leo, that have been detected during flares, and one of them also at a relatively low (`quiescent') state. There are no indications that any of the stars has been spatially resolved. Upper limits on the size of the radio sources are less than 1.9 stellar diameters for flares and less than 3.7 stellar diameters for quiescence. This yields directly observed brightness temperatures beyond 2x10^10^K for flares and 2x10^9^K in quiescence. The observations suggest that the size of the closed corona is less than predicted from pressure equilibrium between plasma and magnetic field. An extent of the order of one density scale height is compatible with the observations.

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