The dwarf nova SS Cygni: what is wrong?

  title={The dwarf nova SS Cygni: what is wrong?},
  author={Matthias R. Schreiber and Jan Lasota},
  journal={arXiv: Astrophysics},
Since the Fine Guiding Sensor (FGS) on the Hubble Space Telescope (HST) was used to measure the distance to SS Cyg to be $166\pm12$ pc, it became apparent that at this distance the disc instability model fails to explain the absolute magnitude during outburst. It remained, however, an open question whether the model or the distance have to be revised. Recent observations led to a revision of the system parameters of SS Cyg and seem to be consistent with a distance of $d\gta 140$ pc. We re… 

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