Abstract
From the analysis of photometric, colorimetric and polarimetric data it follows that high luminosity red variable stars are divided into two groups: group I - double stars with brightness variation periods of more than 480 days, group II - single stars with periods less than 480 days. Moreover, double stars possess: a) high coefficients of correlation between brightness V and U - B, B - V colors; b) relatively low values of U - B (<1.m5) and high infrared excess; c) strong variations of parameters of polarization (>1.5) and often those are associated with maser sources.
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Published in Astrofizika, Vol. 38, No. 4, pp. 549–554, October–December, 1995.
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Vardanian, R.A. On the duplicity of cool giant and supergiant variable stars. Astrophysics 38, 303–306 (1995). https://doi.org/10.1007/BF02044699
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DOI: https://doi.org/10.1007/BF02044699