Binary phase correlated X-ray intensity variations and flaring activity in the RS CVn binary HR 1099

Agrawal, P. C. ; Vaidya, J. (1988) Binary phase correlated X-ray intensity variations and flaring activity in the RS CVn binary HR 1099 Monthly Notices of the Royal Astronomical Society, 235 . pp. 239-253. ISSN 0035-8711

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Abstract

A study of X-ray variability of the RS CVn binary HR 1099 has been carried out. Evidence is found for the variation of the X-ray intensity with the 2.837 day period of the binary. The phase of the X-ray maximum coincides with that of the minimum of the optical wave and the X-ray minimum occurs close to the optical wave maximum. An intense X-ray flare, having rise time of ≥ 16 min, decay time of 76 min, and total 2 - 10 keV X-ray energy release of ≈ 5x1034erg, was detected on 1980 February 17. The X-ray spectrum near the flare peak was hard and is best described by a thermal spectrum with kT = 11.3 (+2.6,-1.8) keV compared to a quiescent state value of 2.0±0.4 keV. A second but less intense flare having decay time of >33 min was detected on 1979 January 31. The binary phase correlated variations are explained in terms of the star spot model.

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