Abstract
We present our JHKLM photometry for R Cas performed during 1988–2000. The pulsation period of R Cas is \(P \approx 429\mathop .\limits^d 6\), with the maximum IR brightness lagging behind the maximum visual brightness by ∼0.2 P. The amplitude of light variations appreciably decreases with increasing wavelength at λ≤3 μm. At λ>3 μm, this decrease virtually ceases. There is a step on the ascending branch of IR JHK brightness. The K-L color index increases linearly with K magnitude: \(K - L = 0.304K + 1\mathop .\limits^m 20\). The color temperature dependence, T K-L =f(K), is also linear: T K−L = −622K + 1100 K. In going from minimum to maximum, the K flux (as well as the bolometric flux) from the star and its color temperature T K-L increase by a factor of ∼2.2 and ∼1.3, respectively.
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 27, No. 5, 2001, pp. 376–380.
Original Russian Text Copyright © 2001 by Nadzhip, Tatarnikov, Shenavrin, Weigelt, Yudin.
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Nadzhip, A.É., Tatarnikov, A.M., Shenavrin, V.I. et al. Infrared observations of the star R Cas. Astron. Lett. 27, 324–327 (2001). https://doi.org/10.1134/1.1368702
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DOI: https://doi.org/10.1134/1.1368702