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      https://www.ias.ac.in/article/fulltext/joaa/042/0065

    • Keywords

       

      Star; late-type; active; X-ray; individual (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 $\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 s$^{-1}$ in the 0.5–2.0 keV energy band.

    • Author Affiliations

       

      JEEWAN C. PANDEY1 GURPREET SINGH1 SUBHAJEET KARMAKAR1 ARTI JOSHI1 2 I. S. SAVANOV3 S. A. NAROENKOV3 M. A. NALIVKIN3

      1. Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 001, India.
      2. School of Physics and Technology, Wuhan University, Wuhan 430072, China.
      3. Institute of Astronomy, Russian Academy of Sciences (INASAN), Pyatnitskaya ul. 48, Moscow 119017, Russia.
    • Dates

       
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