We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The Circumstellar Envelope of the Semiregular Variable Star V CVn.
- Authors
Safonov, B. S.; Dodin, A. V.; Lamzin, S. A.; Rastorguev, A. S.
- 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.
- Subjects
MOSCOW State University; STELLAR parallax; STELLAR oscillations; ASTRONOMICAL observatories; BREWSTER'S angle; SPECKLE interference; VARIABLE stars; SPECKLE interferometry
- Publication
Astronomy Letters, 2019, Vol 45, Issue 7, p453
- ISSN
1063-7737
- Publication type
Article
- DOI
10.1134/S1063773719070065