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Eclipses in Cataclysmic Variables with Stationary Accretion Disks. VI. Is Accretion in UX UMa and RW Tri Really Stationary?

Smak J.

Acta Astronomica

1998

Vol. 48, No. 1

59--63

Disk eclipse light curves of UX UMa and RW Tri are reanalyzed in order to determine two parameters: d log M/d log R, which is a measure of systematic deviations from stationary accretion, and Δlog Tedgeedge, which is a correction to the temperature of the disk's edge. For both systems the resulting values of d log M/d log R are slightly negative, most likely due to irradiation of the innermost parts of the disk by the boundary layer. Taking this into account we conclude that accretion in UX UMa and RW Tri is indeed stationary. For both systems there is no evidence for Δlog T_edge being significantly different from zero. Our results contradict those obtained earlier with the MEM technique by Horne and Stiening (1985) and Rutten et al. (1992), which showed the accretion rate to be a strongly increasing function of the radial distance. This means that even at moderate inclinations (i=73.0 and 70.5 degrees) the MEM technique produces spurious results.