A. Golovin, M. C. Galvez-Ortiz, M. Hernan-Obispo, M. Andreev, J. R. Barnes, D. Montes, E. Pavlenko, J. C. Pandey, R. Martinez-Arnaiz, B. J. Medhi, P. S. Parihar, A. Henden, A. Sergeev, S. V. Zaitsev, N. Karpov
Here we present the study of FR Cnc, a young, active and spotted star. We
performed analysis of ASAS-3 (The All Sky Automated Survey) data for the years
2002-2008 and amended the value of the rotational period to be 0.826518 d. The
amplitude of photometric variations decreased abruptly in the year 2005, while
the mean brightness remained the same, which was interpreted as a quick
redistribution of spots. BVRc and Ic broad band photometric calibration was
performed for 166 stars in FR Cnc vicinity.
The photometry at Terskol Observatory shows two brightening episodes, one of
which occurred at the same phase as the flare of 2006 November 23. Polarimetric
BVR observations indicate the probable presence of a supplementary source of
polarization. We monitored FR Cnc spectroscopically during the years 2004-2008.
We concluded that the RV changes cannot be explained by the binary nature of FR
Cnc. We determined the spectral type of FR Cnc as K7V. Calculated galactic
space-velocity components (U, V, W) indicate that FR Cnc belongs to the young
disc population and might also belong to the IC 2391 moving group. Based on LiI
6707.8 measurement, we estimated the age of FR Cnc to be between 10-120 Myr.
Doppler Tomography was applied to create a starspot image of FR Cnc. We
optimized the goodness of fit to the deconvolved profiles for axial
inclination, equivalent width and v sin i, finding v sin i=46.2 km s^-1 and
i=55 degrees.
The starspot distribution of FR Cnc is also of interest since it is one of
the latest spectral types to have been imaged. No polar spot was detected on FR
Cnc.
View original:
http://arxiv.org/abs/1111.6595
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