A VLA survey of BY Draconis variables

Details A VLA survey of BY Draconis variables A VLA survey of BY Draconis variables

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..887c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 887-893.

Astronomy and Astrophysics

Astronomy

29

Light Curve, Microwave Emission, Radio Astronomy, Stellar Rotation, Variable Stars, Very Large Array (Vla), Circular Polarization, Eclipsing Binary Stars, Flux Density, Late Stars, Nonthermal Radiation, Stellar Luminosity, X Ray Sources

Scientific paper

The authors have observed seven of the most rapidly rotating BY Draconis variable stars with the VLA at 6 cm in order to determine whether there exists a correlation between the microwave emission and the rotationally modulated optical light curve. Only one star, BY Dra itself, was detected during more than one session (≡0.6 - 1.3 mJy). However, there seems to be no strong correlation between the radio emission and the optical light curve over this time period, although a weak one could be present. The data for BY Dra and for four of the other stars in the survey (FF And, CM Dra, CC Eri, and EV Lac) indicate the possibility that flares may be the only source of microwave emission in these stars at this sensitivity. For the four stars (HD 218738, CC Eri, EV Lac, and BY Dra) that have been observed in the X-ray regime, it is clear that an optically thin thermal bremsstrahlung mechanism for the microwave emission is inadequate to explain the data, as has been shown previously for other dMe stars.

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