CAOSP abstracts, Volume: 34, No.: 1, year: 2004
- Author(s): Skopal, A.; Pribulla, T.; Vaňko, M.; Velič, Z.; Semkov, E.; Wolf, M.; Jones, A.
- Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 34, no. 1, p. 45-69.
- Date: 02/2004
- Title: Photometry of symbiotic stars. XI. EG And, Z And, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, RW Hya, AR Pav, AG Peg, AX Per, QW Sge, IV Vir and the LMXB V934 Her
- Keyword(s): Techniques: photometry, Stars: binaries: symbiotic
- Pages: 45 -- 69
We present new photometric observations of EG And, Z And,
BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra,
RW Hya, AG Peg, AX Per, IV Vir and the peculiar M giant
V934 Her, which were made in the standard
Johnson UBV(R) system. QW Sge was measured in the Kron-Cousin
B, V, RC, IC
system and for AR Pav we present its
new visual estimates. The current issue gathers observations
of these objects to December 2003. The main results can be
summarized as follows:
The primary minimum in the U light curve (LC) occurred at
the end of 2002. A 0.2 -- 0.3 mag brightening in U was
detected in the autumn of 2003.
At around August 2002 we detected for the first time a minimum,
which is due to eclipse of the active object by the red giant.
Measurements from 2003.3 are close to those of a quiescent phase.
In February 2003 a short-term flare developed in the LC.
A difference in the depth of recent minima was detected.
This star was in a quiescent phase at a rather bright state.
A shallow minimum occurred at ∼ JD 2 452 730, close
to the position of the inferior conjunction of the giant
in the inner binary of the triple-star model of CH Cyg.
Our observations cover the descending branch of a broad minimum.
At/around the beginning of 2003 the star entered a bright stage
containing a minimum at ∼ JD 2 452 660.
New observations revealed two eruptions, which peaked in
October 2002 and 2003 at ∼ 9.3 in U.
Our new visual estimates showed a transient disappearance
of a wave-like modulation in the star's brightness between
the minima at epochs E = 66 and E = 68 and its reappearance.
Our measurements from the end of 2001 showed rather complex
profile of the LC.
Observations follow behaviour of the wave-like variability of
In May 2003 a 0.5 mag flare was detected following a rapid
decrease of the light to a minimum.
CCD observations in
B, V, RC, IC
bands cover a period from 1994.5 to 2003.5. An increase in the star's
brightness by about 1 mag was observed in all passbands in 1997.
Less pronounced brightening was detected in 1999/2000.
Our observations did not show any larger variation in the optical
as a reaction to its X-ray activity.
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