Flickering amplitude of cataclysmic and symbiotic variables S. Boeva, R. Zamanov, R. Bachev, S. Tsvetkova, K. Stoyanov, G. Latev, B. Spassov IA with NAO “Rozhen”, BAS, Bulgaria S. Boeva, R. Zamanov, R. Bachev, S. Tsvetkova, K. Stoyanov, G. Latev, B. Spassov IA with NAO “Rozhen”, BAS, Bulgaria

Cataclysmic and symbiotic stars

Variability of MWC 560 in the UBVRI bands on 29/30 December 2010.

Variability of MV Lyr in the UBVRI bands on July, 7-th 2009.

F max – F min ~ F av K CH Cyg k=1.48 (propeller) k=1.41 (accretor) (Mikolajewski et al., 1990) MWC 560 (Tomov et al., 1996) T CrB K=1.03 (Zamanov et al., 2004)

KR Aur k = 0.72

MV Lyr k=0.80 MV Lyr k=0.80 (k=0.96 high state; (k=0.96 high state; k=0.94 low state) k=0.94 low state) V 794 Aql k=0.76 V 794 Aql k=0.76 V 425 Cas k=1.23 V 425 Cas k=1.23

RS Oph k = / RS Oph k = /- 0.16

Conclusions The cataclysmic variables have the same dependence of the flickering amplitude on the average flux ΔF ~ F av k like the symbiotic stars. The cataclysmic variables have the same dependence of the flickering amplitude on the average flux ΔF ~ F av k like the symbiotic stars. There are 2 groups of values for parameter k: about 1.40 for symbiotic stars and about 0.80 for the cataclysmic ones. There are 2 groups of values for parameter k: about 1.40 for symbiotic stars and about 0.80 for the cataclysmic ones. In several cases for the flickering amplitude we find 2 different dependences with close values of k in different states of the variable stars. In several cases for the flickering amplitude we find 2 different dependences with close values of k in different states of the variable stars.

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