Coronae of an active fast rotator FR Cnc
Abstract
We present the first detailed X-ray study and simultaneous optical observations of the active fast rotating star FR Cnc. The X-ray spectra are found to be explained by two-temperature plasma model with temperature of cool and hot components of 0.34 and 1.1 keV, respectively. The X-ray light curve in the 0.5-2.0 keV energy band is found to be rotationally modulated with the degree of rotational modulation of ∼17%. We have also found that the X-ray light curve is anti-correlated with the optical light and colour curves in the sense that maximum X-ray light corresponds to minimum optical light and cooler region on the surface of FR Cnc. The X-ray luminosity of FR Cnc is found to be almost consistent in the last 30 years with an average value of 4.85 ×1029 erg s-1 in the 0.5-2.0 keV energy band.
- Publication:
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Journal of Astrophysics and Astronomy
- Pub Date:
- October 2021
- DOI:
- 10.1007/s12036-021-09702-w
- Bibcode:
- 2021JApA...42...65P
- Keywords:
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- Star—late-type—active—X-ray—individual (FR Cnc)