CAOSP abstracts, Volume: 22, year: 1992

Abstract: We present new photoelectric (UBV), photographic and visual observations of 22 selected symbiotic stars. The photoelectric observations were made in 1990-91, the photographic in 1982-91, while the visual observations cover the interval 1973-1991. Some interesting results can be summarized as follows: EG And: Descending branches of the light-curve preceding primary and secondary minima were observed in U. R Aqr: Visual observations confirm the variability with the 44-year period. UV Aur: The 365-day pulsation period of the red giant was confirmed. The most conspicuous change (7.2 - 10.4 mag) was observed in the red band. BF Cyg: The eclipse of the hot component by the cool one was observed between June and September 1991. Its position allowed to determine a new average value of the orbital period equal to 759 days. CH Cyg: A sudden drop of the star's brightness in U, by about 1.5 mag lasting a few days to a few weeks was observed at the beginning of July 1991. 4 Dra: An 0.30 mag increase in U, lasting about 100 days, was observed near the time of spectroscopic conjunction. V 443 Her: A minimum around JD 2 448 433 was observed in several spectral bands. AG Peg: A decrease of the star's brightness near the orbital phase 0.5 was indicated. AX Per: The primary minimum corresponding to the total eclipse of the hot component by the cool one was observed between October 27, 1990 and January 14, 1991.

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