CAOSP abstracts, Volume: 28, No.: 2, year: 1998

Abstract: We present UBVR photometry of V723 Cas (Nova Cas 1995) obtained from January 1997 through March 1998. Using these as well as archival photoelectric and visual observations, we have found an 180 day periodicity of the activity on the declining branch of the light-curve. The stages of activity, characterized by flare(s), occurred after the brightness decreases. Period analysis of the short-term brightness variations and the study of phase light-curves in quiescent stage revealed the most significant period as 0.63 days. The same analysis applied on brightness variations in active stage (January-February 1997) revealed the periods 0.61 days or 2.8 days. Detected periods are interpreted in the frame of possible binary and triple-star models. The evolutionary path of the nova in the two-colour diagram is presented. It is shown, that at brightness maximum, discussed as a super-Eddington event, the main envelope of the nova was ejected with the velocity 210 km/s.

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