Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..777a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 15, 1986, p. 777-784.
Astronomy and Astrophysics
Astronomy
19
Binary Stars, Stellar Flares, Supergiant Stars, Variable Stars, X Ray Spectra, Coronal Loops, Energy Spectra, Proportional Counters, Solar Flares
Scientific paper
The detection of an X-ray flare in the RS CVn binary Sigma Coronae Borealis with the Monitor Proportional Counter on the Einstein Observatory is described. During the 513 min of observation, an X-ray flare of 208 min duration was detected at a significance level of 26σ in the 1.19 - 10.16 keV band. The rise time of the flare is between 25 and 70 min and the decay time is ≥ 34 min. The X-ray luminosity at the flare maximum is found to be 6×1030erg s-1 and the total energy radiated in X-rays during the flare is 2×1034erg. The energy spectrum in the flaring state is found to be harder (temperature T ≡ 2.5×107K) compared to the one observed in the quiescent state (T ≡ 6×106K). Applying the coronal loop model, the loop parameters are calculated and compared for the X-ray flares observed in the various RS CVn binaries and the Sun. The significance of the differences in the observed and derived parameters of the X-ray flares is briefly discussed.
Agrawal Prahlad C.
Rao Ravi A.
Riegler Guenter R.
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