Recent photometry of symbiotic stars - XII

Abstract

We present new photometric observations of 15 symbiotic stars (EG And, Z And, AE Ara, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, Draco C-1, RW Hya, SY Mus, AR Pav, AG Peg, AX Per) covering their last orbital cycle(s) from 2003.9 to 2007.2. We obtained our data by both classical photoelectric and CCD photometry. Main results are: EG And brightened by about 0.3 mag in U from 2003. A 0.5 mag deep primary minimum developed in the U light curve (LC) at the end of 2006. Z And continues its recent activity that began during the 2000 autumn. A new small outburst started in summer of 2004 with the peak U-magnitude of about 9.2. During the spring of 2006 the star entered a massive outburst. It reached its historical maximum at U = 8.0 in 2006 July. AE Ara erupted in 2006 February with Dm(vis) approx. 1.2 mag. BF Cyg entered a new active stage in 2006 August. A brightness maximum (U approx. 9.4) was measured during 2006 September. CH Cyg persists in a quiescent phase. During 2006 June - December about 2 mag decline in all colours was measured. CI Cyg started a new active phase during 2006 May - June. After 31 years it erupted by about 2 mag in U. TX CVn maintains a bright stage with U approx. 10.5 from 2003. AG Dra entered a new major outburst in 2006 June. It reached its maximum at U = 8.0 in 2006 September. AR Pav persists at a low level of the activity. AG Peg's LC profile varies markedly during different orbital cycles. AX Per continues its quiescent phase.

arXiv comment4 pages text, 12 figures, 18 tables, accepted for publication in Astron. Nachrichten

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• An Online Catalog of Cataclysmic Variable Spectra from the Far Ultraviolet Spectroscopic Explorer
• New outburst of the symbiotic nova AG Peg after 165 years
• The origin of the supersoft X-ray--optical/UV flux anticorrelation in the symbiotic binary AG Draconis
• The spectral energy distribution of D-type symbiotic stars: the role of dust shells
• AG Pegasi - now a classical symbiotic star in outburst?
• Spectroscopic view on the outburst activity of the symbiotic binary AG Draconis
• Discovery of the 1.80 hr Spin Period of the White Dwarf of the Symbiotic System BF Cyg
• EG Andromedae: A New Orbit and Additional Evidence for a Photoionized Wind
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• The symbiotic star CH Cygni. II. The broad Ly alpha emission line explained by shocks
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• Notices to investigation of symbiotic binaries V. Physical parameters derived from UBV magnitudes
• The historical light curve of the symbiotic star AG Draconis: intense, magnetically induced cyclic activity
• Photometry of Symbiotic Stars - XIV
• The long-term spectroscopic misadventures of AG Dra with a nod toward V407 Cyg: Degenerates behaving badly