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Searching for Flickering Variability in Several Symbiotic Stars and Related Objects: BX Mon, V471 Per, RS Oph, V627 Cas, CI Cam, V886 Her, Z And, T CrB, MWC 560, V407 Cyg

Gromadzki M., Mikołajewski M., Tomov T., Bellas-Velidis I., Dapergolas A., Gałan C.

Acta Astronomica

2006

Vol. 56, No. 1

97--125

UBVRI photometric observations of 10 symbiotic stars and related objects obtained in the period 2002-2003 are presented. Analyzing differential light curves we found rapid light variations with timescales of tens of minutes and significant amplitudes in the well-known flickers MWC 560, RS Oph, V407 Cyg and T CrB. MWC 560 and V407 Cyg demonstrate quasi periodic oscillations (QPO) with similar amplitudes and timescales. Flickering and unusual flare in V627 Cas as well as some indications of flickering presence in BX Mon are detected. The existence of 29 min oscillations in Z And with an amplitude ≈0.02 mag in the U-band is confirmed. Only one symbiotic star, V471 Per, and both non symbiotic, CI Cam and V886 Her, seem to be constant on flickering timescales. Nevertheless, small night to night changes in the brightness of V886 Her were observed as well.