Flickering amplitude of cataclysmic and symbiotic variables

1. 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

2. Cataclysmic and symbiotic stars

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

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

5. F max – F min ~ F av KCH 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)

6. KR Aur k = 0.72

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

8. RS Oph k = 1.44 +/- 0.16

9. Conclusions • The cataclysmic variables have the same dependence of the flickering amplitude on the average flux ΔF ~ Favk 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. • In several cases for the flickering amplitude we find 2 different dependences with close values of k in different states of the variable stars.

10. Thank you for your attention!