Rotational modulation and flares on RS CVn and BY Dra-type stars. V - EXOSAT and IUE observations of a flare on EQ Pegasi

Details Rotational modulation and flares on RS CVn and BY Dra-type stars. V - EXOSAT and IUE observations of a flare on EQ Pegasi Rotational modulation and flares on RS CVn and BY Dra-type stars. V - EXOSAT and IUE observations of a flare on EQ Pegasi

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...181...96h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 181, no. 1, July 1987, p. 96-102. Research supported by the Lockheed Independe

Astronomy and Astrophysics

Astronomy

38

Binary Stars, Light Curve, Spaceborne Astronomy, Stellar Flares, Stellar Rotation, Ultraviolet Astronomy, Exosat Satellite, Iue, Stellar Spectrophotometry, X Ray Spectra

Scientific paper

Time-trailed UV spectra and a soft X-ray lightcurve were obtained during a flare on the binary dMe star EQ Peg AB. On the basis of solar flare Mg II surface fluxes and an about 70-percent enhancement in the disk-integrated flux during the flare on EQ Peg, it is estimated that the chromospheric flare covered about 1.5 percent of the stellar surface. The size scale is estimated to be comparable to that of a solar two-ribbon flare. This unusual flare is noted to exhibit a low-energy soft X-ray rise phase which is longer than that of most flares; it is longer than the decay phase and peaks much later than the medium energy light curve. Evidence of variable Fe II emission and variable continuum emission in select UV bands during the flare is noted.

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