Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..167h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 167-175.
Astronomy and Astrophysics
Astrophysics
24
Accretion Disks, Astronomical Spectroscopy, Cataclysmic Variables, Dwarf Novae, Eclipsing Binary Stars, White Dwarf Stars, Absorption Spectra, Balmer Series, Emission Spectra, Late Stars, Stellar Temperature
Scientific paper
Time-resolved spectroscopy of the eclipsing dwarf nova OY Carinae is presented. Previous photometric analyses as well as the behavior of the broad Balmer absorption lines in and out of eclipse indicate that these features originate in the white dwarf rather than in an optically thick disk. Comparisons between the observed and theoretical profiles indicate a temperature for the white dwarf of 15000 + or - 2000 K. The Balmer and He I emission lines and their central absorption components show unexpected structure, including the presence of a 'hot spot' in emission. These features do not lend support for the presence of noncircular motions in the accretion disk. Previous spectroscopic estimates for the K-velocity of the white dwarf are shown to have been too high, bringing the orbital elements for this unique system in line with those determined from recent photometric analyses.
Barwig Heinz
Hessman Frederic V.
Koester Detlev
Schoembs R.
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