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FR Cnc revisited: photometry, polarimetry and spectroscopy

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dc.contributor.author Golovin, A
dc.contributor.author Galvez-Ortiz, M. C
dc.contributor.author Hernan-Obispo, M
dc.contributor.author Andreev, M
dc.contributor.author Barnes, J. R
dc.contributor.author Montes, D
dc.contributor.author Pavlenko, E
dc.contributor.author Pandey, J. C
dc.contributor.author Martinez-Arnaiz, R
dc.contributor.author Medhi, B. J
dc.contributor.author Parihar, P. S
dc.contributor.author Henden, A
dc.contributor.author Sergeev, A
dc.contributor.author Zaitsev, S. V
dc.contributor.author Karpov, N
dc.date.accessioned 2012-03-13T13:53:13Z
dc.date.available 2012-03-13T13:53:13Z
dc.date.issued 2012-03
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 421, No. 1, pp. 132–148 en
dc.identifier.uri http://hdl.handle.net/2248/5731
dc.description Restricted Access en
dc.description.abstract This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the study of FR Cnc, a young, active and spotted star. We performed analysis of All Sky Automated Survey 3 (ASAS-3) data for the years 2002–08 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 2004–08.We concluded that the radial velocity 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 Li I λ6707.8 measurement, we estimated the age of FR Cnc to be between 10 and 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 kms−1 and i = 55◦. We also generated a synthetic V -band light curve based on Doppler imaging that makes simultaneous use of spectroscopic and photometric data. This synthetic light curve displays the same morphology and amplitude as the observed one. 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. en
dc.language.iso en en
dc.publisher Wiley-Blackwell en
dc.relation.uri http://dx.doi.org/10.1111/j.1365-2966.2011.20262.x en
dc.rights © Wiley-Blackwell en
dc.subject Stars: activity en
dc.subject Stars: flare en
dc.subject Stars: individual: FR Cnc en
dc.subject Stars: rotation en
dc.title FR Cnc revisited: photometry, polarimetry and spectroscopy en
dc.type Article en

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