Infrared observations of the star R Cas |
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| Authors: | A É Nadzhip A M Tatarnikov V I Shenavrin G Weigelt B F Yudin |
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| Institution: | (1) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899, Russia;(2) Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, Bonn, D-53121, Germany |
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| 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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| Keywords: | stars— variable and peculiar |
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