Microwave observations of late-type stars with the Very Large Array

Details Microwave observations of late-type stars with the Very Large Array Microwave observations of late-type stars with the Very Large Array

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149...95p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 95-101. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

50

Cool Stars, Flare Stars, Magnetic Stars, Microwave Emission, Radio Stars, Stellar Activity, Very Large Array (Vla), Binary Stars, Circular Polarization, Late Stars, Nonthermal Radiation, Radiant Flux Density, Radio Bursts, Stellar Coronas, Synchrotron Radiation, Very Long Base Interferometry

Scientific paper

The Very Large Array was used to search for microwave emission from 32 stars of late spectral type including RS CVn type stars, dwarf M stars, and stars with active chromospheres, coronae, or intense magnetic fields. The RS CVn stars were detected at 6 cm wavelength, and upper limits are established for another six. Radio emission was detected from three dwarf M flare stars, UV Cet, EQ Peg and YZ CMi. Both impulsive (no more than 20 s) and more gradual (at least ten minutes) bursts were observed from the flare star YZ CMi. Radio emission was not confirmed at 6 cm from the solar type star Chi(1) Ori, with an upper limit that is three times lower than the detections reported by other observers. Microwave emission could not be detected from any other solar type star of spectral class F to K. The quiescent radio emission from dwarf M flare stars was interpreted as nonthermal gyrosynchrotron emission by mildly relativistic electrons accelerated more or less continuously in the magnetic fields of starspots.

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