Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..176b&link_type=abstract
Astronomy Reports, Volume 43, Issue 3, March 1999, pp.176-184
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Emission-line profiles for spectra of the nova U Gem obtained during a quiescent state in January and December 1994 are modeled. The observed variations of parameters for the accretion-disk model with orbital phase cannot be explained in terms of Keplerian motion of the disk material. The variations could be associated with spiral shocks in the accretion disk. The sizes of the regions of formation of various spectral lines decrease with the ionization potential of the line, and are different for the two observing sessions. The increase of the surface brightness of the disk toward the center also becomes stronger with increasing ionization potential. The bright spot on the accretion disk, which is the source of the non-stationary emission-line component, is optically thin. A substantial fraction of the radiation of this component forms in material reflected from the accretion disk after it interacts with the inflowing stream near the disk. The radial velocity of the material emitting in various lines decreases from Hβ to Hdelta.
Borisov N. V.
Neustroev Vitaly
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