CAOSP abstracts, Volume: 28, No.: 2, year: 1998
- Author(s): SKOPAL, A.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 28, no. 2, p. 87-100.
- Date: 10/1998
- Title: Photometry of symbiotic stars VIII. EG And, TX CVn, BF Cyg, CH Cyg, AG Dra
and AX Per
- Keyword(s): STARS, BINARIES, SYMBIOTIC, PHOTOMETRY
- Pages: 87 -- 100
Abstract:
We present photoelectric U,B,V,R observations of 6 classical symbiotic
stars. The main results can be summarized as follows:
EG And (HD 4174, BD+39 167) : A sinusoidal variation displaying two maxima
(minima) during the orbital period was observed also in the R band.
TX CVn (HD 63173, BD+37 2318): A periodic, ~190-day, variation in the U band
was found, corresponding to the orbital period of the binary. The shaping and
colour indices of the minima suggest that they are probably caused by eclipses.
BF Cyg (MWC 315, Hen 1747): A wave-like variation in the light curve (LC)
indicates that the system has finally returned to quiescence. A minimum of the
light was observed at JD 2 450 684.5.
CH Cyg (HD 182917, BD+49 2999): This star persisted in a quiescent phase till
May 1998. The last observations indicate a brightening of ~1.5 mag in U,
showing that CH Cyg just entered a new active phase.
AG Dra (SAO 16931, BD+67 922): Our measurements cover the recent eruption
centred around JD 2 450 670 (1997.6) and the following minimum.
AX Per (MWC 411, GCRV 896): The recent photometry revealed a deep minimum
lasting about 400 days around JD 2 450 280 (1996.5). The timing of two other
minima in the historical LC and colour indices during the recent minimum
suggests that they can be caused by eclipses of the inner binary (the symbiotic
pair, P_orb=680 days) by a giant star (R ~ 200-300 R_Sun) orbiting it in a
long-period (46.5-yr) orbit.
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