Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156...95d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 95-100. Research supported by the Ministero della
Astronomy and Astrophysics
Astronomy
41
Flare Stars, X Ray Astronomy, X Ray Stars, Astronomical Photography, Binary Stars, Radio Astronomy
Scientific paper
The authors present a first report on a campaign for simultaneous observations in the visual, radio and X-ray ranges of stellar flares on the binary BY Dra. During two nights of observations they observed one significant flare, simultaneously in soft X-rays and visible wavelengths, and one or two smaller bursts. The main flare impulsively heated an area of ⪉2×107km2 of the stellar photosphere to a brightness temperature ⪆25000K, during about 5 min, and generated hot plasma, emitting soft X-rays. This emission reached maximum after the impulsive burst and lasted for about an hour; it covered a much larger area on the star than the optical emission. There was no significant hard X-ray component. The authors ascribe the optical continuous emission to the flare's impulsive phase, and the soft X-ray emission to the gradual phase.
Avgoloupis S.
Cutispoto Giuseppe
de Jager Cornelis
Heise Jaret
Herr Richard B.
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