[vsnet-alert 9336] GW Lib: rapid fading and superhump phase reversal

[Taichi Kato]

Dear all,

   A preliminary analysis of GW Lib observations (Monard, Nakajima-san,
Kiyota-san, and more observers) has shown:

  (1) The rapid fading stage started on May 6, followed by a steeper
decline (KANATA team)

  (2) A clear phase reversal of the superhump signal was observed
since late May 5 (just before the fading).  These superhumps were
thus "late superhumps".  On May 4, the amplitude of the superhumps
remarkable decreased, probably due to the emergence of late
superhumps.

  (3) O-C's of superhump timings showed a clear positive Pdot
during the plateau phase before the phase reversal happened.
More detailed timing analysis will be reported by Imada-san.

   The Kyoto team also obtained further observations, which will
be analyzed.