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Astronomy Letters

, Volume 45, Issue 9, pp 602–604 | Cite as

Activity of the Red Dwarf FR Cnc from Observations with a Robotic IRT-20 Telescope at the Zvenigorod Observatory of INASAN

  • I. S. SavanovEmail author
  • S. A. Naroenkov
  • M. A. Nalivkin
  • J. C. Pandey
  • S. Karmakar
Article
  • 6 Downloads

Abstract

We present the results of our new photometric observations of the chromospherically active star FR Cnc performed with a robotic telescope at the Zvenigorod Observatory of INASAN in March 2019. The observations were carried out from March 2 to 13, 2019, in the period of time that coincided most closely in time interval with the observations of this star with the Astrosat space telescope. A total of 450 magnitude estimates were obtained in each of the B, V, and R photometric bands over 12 days (from HJD 2458545.2 to HJD 2458556.5). Based on the V-band photometric variability of the star, we have constructed a map of surface temperature inhomogeneities. According to our estimate, the spot area on the surface of the star was ~12% of its total surface area in early 2019. On March 3, 2019, a flare on FR Cnc was detected during our observations at a time corresponding to HJD = 2458554.25891447 or rotation phase 0.8. The data for the flare suggest a rapid brightening of the star by 0.19m in the B band and by 0.09m in the V band; the flare lasted for about 60 min. The energy radiated in the flare was ITEB = 2.17 × 1033 erg and Ey = 1.40 × 1033 erg in the B and V bands, respectively.

Keywords

Variable stars 

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Notes

Funding

This study was supported by the Russian Foundation for Basic Research (project no. 17-52-45048).

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  • I. S. Savanov
    • 1
    Email author
  • S. A. Naroenkov
    • 1
  • M. A. Nalivkin
    • 1
  • J. C. Pandey
    • 2
  • S. Karmakar
    • 2
  1. 1.Institute of Astronomy, Russian Academy of Sciences (INASAN)MoscowRussia
  2. 2.Aryabhatta Research Institute of Observational Sciences (ARIES)NainitalIndia

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