CAOSP abstracts, Volume: 32, No.: 1, year: 2002
- Author(s): SKOPAL, A.; VANKO, M.; PRIBULLA, T.; WOLF, M.; SEMKOV, E.; JONES, A.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso, vol. 32, no. 1, p. 62-78.
- Date: 04/2002
- Title: Photometry of symbiotic stars. X. EG And, Z And, BF Cyg, CH Cyg, V1329 Cyg, AG Dra, RW Hya, AX Per and IV Vir
- Keyword(s): STARS, BINARIES, SYMBIOTIC, PHOTOMETRY
- Pages: 62 -- 78
We present new photometric observations of EG And, Z And, BF Cyg,
CH Cyg, V1329 Cyg, AG Dra, RW Hya, AX Per and IV Vir made in the
standard Johnson UBVR system. The current issue summarizes observations
of these objects to 2001 December. The main results can be summarized
A periodic double-wave variation in all bands as a function
of the orbital phase was confirmed. A maximum of the light changes
was observed in U (Delta U ~ 0.5 mag).
Our observations cover an active phase, which peaked around 8.4 in U
at the beginning of 2000 December. Consequently, a gradual decrease in
the star's brightness has been observed.
A periodic wave-like variation in the optical continuum reflects
a quiescent phase of this star. A complex light curve (LC) profile
The recent episode of activity ended in Spring 2000. We determined
the position of an eclipse in the outer binary at JD 2451426 +/- 3.
Recent observations indicate a slow increase in the star's brightness.
Observations were made around a maximum at 2001.2.
Our measurements from the Autumn of 2001 revealed a new eruption, which
peaked at ~JD 2452217.
The light minimum in our mean visual LC precedes the time of
the spectroscopic conjunction of the giant in the binary.
A periodic wave-like variation was observed. Our recent observations
revealed a secondary minimum at the orbital phase 0.5, seen best in
the V and B bands.
The LC displays a double-wave throughout the orbital cycle.
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