The Masses and Evolutionary State of the Stars in the Dwarf Nova SS Cygni

  title={The Masses and Evolutionary State of the Stars in the Dwarf Nova SS Cygni},
  author={Martin A. Bitner and Edward L. Robinson and Bradford Bartholomew Behr},
  journal={The Astrophysical Journal},
  pages={564 - 573}
The dwarf nova SS Cygni is a close binary star consisting of a K star transferring mass to a white dwarf by way of an accretion disk. We have obtained new spectroscopic observations of SS Cyg. Fits of synthetic spectra for Roche lobe-filling stars to the absorption-line spectrum of the K star yield the amplitude of the K star's radial velocity curve and the mass ratio, KK = 162.5 ± 1.0 km s-1 and q = MK/MWD = 0.685 ± 0.015. The fits also show that the accretion disk and white dwarf contribute a… 
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