Abstract
V CVn is a red semiregular variable star with an amplitude of its V-band brightness variations of ≈2m. An unusually high amplitude of its polarization variability, up to 6%, a noticeable inverse correlation between polarization and total flux, and relative constancy of the angle of polarization distinguish this star from other semiregular variables. To clarify the nature of these peculiarities, we have observed the object with the 2.5-m telescope at the Caucasian Observatory of the Sternberg Astronomical Institute of the Moscow State University using differential speckle polarimetry at wavelengths of 550, 625, and 880 nm. The observations were performed on 20 dates distributed over three pulsation periods. We have detected an asymmetric reflection nebula around the star at a distance of ≈35 mas. Three regions that change their brightness with the same characteristic time scale as the star, but with different phase shifts are identified in the nebula. We consider several hypotheses that could explain this behavior.
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Acknowledgments
We are grateful to the staff of the Caucasian Observatory of the Sternberg Astronomical Institute for the help with the observed used in this paper and to the referee for the remarks that allowed the quality of the data presentation to be improved. We used observations from the International AAVSO database.
Funding
This work was financially supported by RFBR grant nos. 16-32-60065 (B.S. Safonov—the observations and data reduction), 19-02-00611 (A.S. Rastorguev—the interpretation), and the Program for Development of the Moscow State University, Leading scientific School “Physics of Stars, Relativistic Objects, and Galaxies” (A. V. Dodin—the interpretation). The speckle polarimeter of the 2.5-m telescope was created under financial support of the Program for Development of the Moscow State University.
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Russian Text © The Author(s), 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 7, pp. 507–516.
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Safonov, B.S., Dodin, A.V., Lamzin, S.A. et al. The Circumstellar Envelope of the Semiregular Variable Star V CVn. Astron. Lett. 45, 453–461 (2019). https://doi.org/10.1134/S1063773719070065
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DOI: https://doi.org/10.1134/S1063773719070065