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 \(\sim\)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 \(4.85\times 10^{29}\) erg \(\hbox {s}^{-1}\) in the 0.5–2.0 keV energy band.
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Acknowledgements
This research is based on the results obtained from the AstroSat mission of the Indian Space Research Organisation (ISRO), archived at the Indian Space Science Data Centre (ISSDC). This work has been performed utilizing the calibration data-bases and auxiliary analysis tools developed, maintained and distributed by AstroSat-SXT team with members from various institutions in India and abroad. This research has been done under the Indo-Russian DST-RFBR Project reference INT/RUS/RFBR/P-271 (for India) and Grant RFBR Ind a 14-02-92694, 17-52-45048 and Grant No. 075-15-2020-780 (for Russia). We acknowledge the referee for reading our paper and his/her comments.
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This article is part of the Special Issue on “AstroSat: Five Years in Orbit”.
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Pandey, J.C., Singh, G., Karmakar, S. et al. Coronae of an active fast rotator FR Cnc. J Astrophys Astron 42, 65 (2021). https://doi.org/10.1007/s12036-021-09702-w
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DOI: https://doi.org/10.1007/s12036-021-09702-w