Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aca....48...59s&link_type=abstract
Acta Astronomica, v.48, pp.59-63, (1998).
Astronomy and Astrophysics
Astronomy
1
Binaries: Eclipsing, Novae: Cataclysmic Variables, Stars: Individual: Ux Uma: Rw Tri
Scientific paper
Disk eclipse light curves of UXUMa and RWTri are reanalyzed in order to determine two parameters: d log dot{M}/d log R, which is a measure of systematic deviations from stationary accretion, and Delta log Tedge, which is a correction to the temperature of the disk's edge. For both systems the resulting values of d log dot{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 Delta log Tedge 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.
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