Infrared Observations of the Star R Cas

Details Infrared Observations of the Star R Cas Infrared Observations of the Star R Cas

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27..324n&link_type=abstract

Astronomy Letters, vol. 27, p. 324-327 (2001)

Astronomy and Astrophysics

Astronomy

3

Variable And Peculiar Stars

Scientific paper

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 < 3 micrometers. At lambda > 3 micrometers, 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: KL = 0.304 K + 1.20 mag. The color temperature dependence, T_{K-L} = f(K), is also linear: T_{K-L} = (-622 K + 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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