Hot SPOT Eclipses in Dwarf Novae

Details Hot SPOT Eclipses in Dwarf Novae Hot SPOT Eclipses in Dwarf Novae

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aca....46..377s&link_type=abstract

Acta Astronomica, v.46, pp.377-387, (1996).

Astronomy and Astrophysics

Astronomy

12

Binaries: Eclipsing, Novae: Cataclysmic Variables, Stars: Individual: Oy Car: Z Cha: U Gem: Ip Peg

Scientific paper

Eclipses of the hot spot in four dwarf novae: U Gem, IP Peg, Z Cha, and OY Car are re-analyzed, assuming two models for the shape of the spot. In Model 1 an elliptical spot is assumed, with the semi-axes s_a in the orbital plane and s_b perpendicular to the orbital plane, its center located on the stream trajectory. The results show that such an ellipse is, within errors, tangent to the disk's circumference. In all four cases the resulting dimensions of the spot s_a are larger than the theoretical cross-section of the stream. Accordingly, in Model2 the spot is assumed to consist of a head, centered on the stream trajectory, and a tail, extending downstream, ie., along disk's circumference. In some cases the resulting parameters, eg., mass ratios or disk radii, differ significantly from those obtained with Model 1.

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