... study

based on observations obtained at Rozhen National Astronomical Observatory, Bulgaria, at Hoher List, Germany and at Kryoneri, Greece.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... analysis

The detection of "positive superhumps" in DW UMa indicates a lower value of $q\sim0.30{-}0.33$. This is well in the $1\sigma$ range given by Araujo-Betancor et al. (2003). We tried eclipse mapping with q=0.3, but this did not change the results significantly. The results presented below are obtained with q=0.39.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...$0.75R_{\rm L_1}$

We stress that the fact that we see this behavior on the rising branch of the low state does not necessarily mean that one should expect the opposite on the falling branch.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... Kurucz

Available at http://cfaku5.harvard.edu

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...$0.07{-}0.1~R_{\rm disc}$

This refers to the height above the disc mid-plane. The actual size of the rim is twice larger.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... simulations

Note that in the disc geometry assumed, the angle at which given disc element is seen is also a function of the orbital phase. In this case the foreshortening and limb-darkening have to be applied simultaneously and they become part of the visibility function (or projection matrix) applied to the disc elements.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.