Outburst cycle 880-1240 d. Maximum has varied between V= 9.7 and 11.3.
3
GCVS Team
SB2 (sdBE + K2IVp). The following types of activity are being observed after the return to the normal brightness: rapid irregular variations (Delta(m) ~0.1m in several minutes); irregular fluctuations from night to night (Delta(m) up to 0.3m); slow irregular variations (Delta(m) = 1.5m in several dozen days); bursts with light increase in 10d - 30d and decrease in 10d - 40d, Delta(m) up to 3.5m, the mean interval between bursts being delta(t) = 820d [F.Sabbadin, A.Bianchini, AsAp Suppl 54, 393, 1983., R.Hudec, BAC 35, N3, 150, 1984.]. According to [D.Crampton, A.P.Cowley, W.A. Fisher, ApJ 300, 788, 1986.], the radial velocities are represented with the elements Max (Vr > 0) = 2444912.966 + 1.996803d*E (Kabs = 124 km/s, Kem = 34 km/s). According to [N.E.Kurochkin, E.A.Karitskaya, Astron. Tsirk. N1441, 1986.], the 2d variation is modulated with a period of 0.131623d, Max (delta(Vr)) ~2443787.995 (Kabs = 15 km/s, Kem = 20 km/s). During a burst the sinusoidal modulation of X-ray flux was recorded, Tmax = 24455555.67456 + 0.004066443d*E [M.G.Watson, A.R.King, J.Osborne, MN 212, N4, 917, 1985.]. ExpAnding envelope (0.454"/yr, 1948 - 1964; 0.432"/yr, 1964 - 1981, [L.Muench, BAAS 16, 217, 1984.]).
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