Statistics – Computation
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205..181v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 181-196. ZWO-supported research.
Statistics
Computation
68
Binary Stars, Computational Astrophysics, Exosat Satellite, Stellar Flares, X Ray Astronomy, Corona Borealis Constellation, Emission Spectra, Light Curve, Stellar Coronas, Stellar Rotation, Stellar Temperature
Scientific paper
The RS CVn binary sigma2 Coronae Borealis was observed with medium-energy and low-energy detectors and the transmission grating spectrometer aboard EXOSAT, and a strong X-ray flare rising within about five minutes and lasting more than two hours was detected. The temperature rises steeply within three minutes from 19 MK to a value well above 70 MK, while the emission measure attains a maximum of 6 x 10 to the 53rd/cu cm five minutes later. The e-folding time is about half an hour. The flare volume and density are estimated and, on the basis of the short rise time of the flare, can be classified as a compact flare. The flare energy requirements are discussed, and it is found that current-driven turbulence can produce such fast heating. An equivalent-circuit description is presented.
Brinkman Albert C.
Mewe Rolf
van den Oord H. J. G.
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