mu = 0.38", p = 286deg. SB (Porb = 0.032306d). Unique object G 61-29. Consists of two interacting white dwarfs. The lower mass star, a helium white dwarf, transfers mass to the higher mass star surrounded by an accretion disk. Usually flares are being observed with an amplitude about 0.2m V, 0.5m U lasting about 20 seconds [B.Warner, MN 159, N3, 315, 1972., J.Smak, AA 25, N3, 227, 1975.]. Sometimes periods of photometric activity arise when amplitude of light variations reaches 0.6m V and sharp passages from maxima to minima are being observed; the duration of these minima reaches up to 0.14d [B.Warner, MN 159, N3, 315, 1972.]. When the star is most active, periodic light oscillations appear with P = 105 seconds and amplitude 0.05m - 0.10m V [H.B.Richer, J.R.Auman, B.C. Iscerwood, J.P.Steele, T.J. Ulrych, ApJ 180, 107, 1973.].
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