Affiliation:
1. Space Research and Technology Institute, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Abstract
We present our results on two Z Cam stars: Z Cam and AT Cnc. We apply observational data for the periods that cover the states of outbursts and standstills, which are typical for this type of object. We report an appearance of periodic oscillations in brightness during the standstill in AT Cnc, with small-amplitude variations of 0.03–0.04 mag and periodicity of ≈20–30 min. Based on the estimated dereddened color index (B − V)0, we calculate the color temperature for both states of the two objects. During the transition from the outburst to the standstill state, Z Cam varies from bluer to redder, while AT Cnc stays redder in both states. We calculate some of the stars’ parameters as the radii of the primary and secondary components and the orbital separation for both objects. We construct the profiles of the effective temperature in the discs of the two objects. Comparing the parameters of both systems, we see that Z Cam is definitely the hotter object and we conclude that it has a more active accretion disc.
Reference49 articles.
1. Transitions to and from Stable Discs in Cataclysmic Variable Stars;Warner;Astrophys. Space Sci.,1995
2. Warner, B. (2003). Cataclysmic Variable Stars, Cambridge University Press.
3. Cataclysmic variables;Smith;Contemp. Phys.,2006
4. The Structure of Cataclysmic Variables;Robinson;Annu. Rev. Astron. Astrophys.,1976
5. New Insights into Classical Novae;Chomiuk;Annu. Rev. Astron. Astrophys.,2021