Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
A.E. Nadzhip, A.M. Tatarnikov, V.I.
Shenavrin, G. Weigelt, and B.F. Yudin
Infrared observations of the star R Cas
Astronomy Letters 27, 324-327 (2001)
Abstract.
We present our JHKLM photometry for R Cas performed during 1988-2000.
The pulsation period of R Cas is P =429.6 days, 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 lambda < 3µm.
At lambda > 3µm, 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 = 0.304 K + 1.20. The color temperature dependence,
TK-L = f(K), is also linear: TK-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 TK-L increase by a
factor
of ~2.2 and ~1.3, respectively.
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