Photometry of symbiotic stars. IX. TX CVn, CH Cyg, AX Per and AR Pav

Details Photometry of symbiotic stars. IX. TX CVn, CH Cyg, AX Per and AR Pav Photometry of symbiotic stars. IX. TX CVn, CH Cyg, AX Per and AR Pav

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000coska..30...29s&link_type=abstract

Contributions of the Astronomical Observatory Skalnate Pleso, vol. 30, no. 1, p. 29-42.

Astronomy and Astrophysics

Astronomy

8

Stars, Binaries, Symbiotics, Photometry

Scientific paper

We present new photometric observations of TX CVn, CH Cyg, AX Per and AR Pav. The main results can be summarized as follows: TX CVn: The historical 1893-2000 photographic/B-band light curve (LC) is presented for the first time. From 1892 to ~1920, the star was quiet, but then entered a series of outbursts peaking in 1920, 1945, 1952 and 1962. From ~1988 till the present time, TX Cvn has gradually declined. CH Cyg: Our observations cover an active phase, which began in May 1998. At the beginning of June 1999 the star's brightness in the U band rapidly decreased due to an eclipse of the active inner binary (the symbiotic pair) by a cool giant in the outer orbit. AX Per: The historical 1887-2000 photographic/B-band LC is summarized here for the first time. It is characterized by long-lasting periods of quiescence with the superposition of a few bright stages lasting about 1.5 orbital cycles. Our photoelectric U,B,V observations revealed a drastic change in the LC profile, which occurred after JD 2 450 000 (1995.8). A small 0.6 mag flare at that time and consequently very broad wave-like variation in the LC developed. This event was caused by the dilution of a shell around the hot star. AR Pav: Our observations show that the recent active phase, which began in 1985.7 is over. During the activity, AR Pav developed a complex wave-like variation at the level of ~1.5 mag in the visual band. The transition to a quiet phase was rapid -- the wave-like variation disappeared.

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