Structure of the accretion disk of the dwarf nova WZ Sagittae

Details Structure of the accretion disk of the dwarf nova WZ Sagittae Structure of the accretion disk of the dwarf nova WZ Sagittae

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..748n&link_type=abstract

Astronomy Reports, Volume 42, Issue 6, November 1998, pp.748-756

Astronomy and Astrophysics

Astronomy

9

Scientific paper

The spectroscopic observations of the dwarf nova WZ Sge in May 1994 are presented. An analysis of the dependence of the degree of asymmetry of the Hα emission profile on orbital phase has revealed two bright spots on the accretion disk in the system. Their positions are determined. We obtain the accretion-disk parameters and the phase dependence of the spot luminosities by modeling the Hα profiles. The size of the Hα emission region is estimated. Its comparison with other data indicates that the radius of the accretion disk in WZ Sge decreases during the outburst cycle (32.5 years) by about 15%. Doppler tomography was used to ascertain the structure of the accretion disk and show that the secondary component also contributes to the Hα emission.

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