The Longperiod Symbiotic Binary Ch-Cygni - Part Two - the M Giant Component - Increasing Pulsation Period and Spot-Like Activity

Details The Longperiod Symbiotic Binary Ch-Cygni - Part Two - the M Giant Component - Increasing Pulsation Period and Spot-Like Activity The Longperiod Symbiotic Binary Ch-Cygni - Part Two - the M Giant Component - Increasing Pulsation Period and Spot-Like Activity

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..127m&link_type=abstract

Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 127, 1992

Astronomy and Astrophysics

Astrophysics

26

Cr Cyg, Long-Period Variables, Pulsations, Spot Activity, Symbiotic Binaries

Scientific paper

We discuss multicolor photometry of CR Cygni obtained in 1986-1991, in terms of variability of the M giant. The giant pulsates radially in the first overtone with a period of ˜100 d and an amplitude of ˜Om.5. The O-C diagram has been obtained for mean dates of minimum from intervals covering a dozen or so pulsation cycles using a linear ephemeris derived for the 100d pulsation. The O-C's indicate a systematic increase of the pulsation period at a rate of about 5d/100 yr. This phenomenon must be related to changes in the internal structure of the M giant. We are unable, however, to ascertain whether the systematic decrease in optical light reported in Paper I has the same cause as the period increase or it is due to increasing spot activity. Some arguments are given that the very deep minimum that occurred in the optical and infrared light in 1990 can be due to large cool spot(s) on the giant's photosphere.

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