A search for radio emission from flare stars in the Pleiades

Details A search for radio emission from flare stars in the Pleiades A search for radio emission from flare stars in the Pleiades

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..794b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 794-803.

Astronomy and Astrophysics

Astronomy

16

Color-Magnitude Diagram, Flare Stars, Pleiades Cluster, Radio Emission, Stellar Flares, X Ray Sources, Interstellar Matter, Orion Constellation, Radio Sources (Astronomy), Solar Neighborhood, Star Formation, Stellar Mass

Scientific paper

The authors have used the VLA to search for radio emission from flare stars in the Pleiades. Two observational strategies were employed. First, about 1/2 deg2 of the cluster, containing ≈40 known flare stars, was mapped at 1.4 GHz at two epochs. More than 120 sources with flux densities >0.3 mJy exist on the maps. Detailed analysis shows that all but two of these sources are probably extragalactic. The two sources identified as stellar are probably not Pleiades members as judged by their proper motions; rather, based on their colors and magnitudes, they seem to be foreground G stars. The second observational strategy, where five rapidly rotating flare stars were observed at three frequencies, yielded no detections. The 0.3 mJy flux-density limit of this survey is such that only the most intense outbursts of flare stars in the solar neighborhood could have been detected if those stars were at the distance of the Pleiades. Hence, while the activity on flare stars in the Pleiades may be somewhat in excess of that on flare stars in the solar neighborhood, the "superflares" that have been occasionally reported in the Pleiades and in Orion must be very rare or nonexistent.

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