[vsnet-alert 15986] ASASSN-13ax: more on superhumps

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Mon Jul 15 14:46:15 JST 2013

ASASSN-13ax: more on superhumps

   Ian Miller and Enrique de Miguel have reported new observations.

   De Miguel wrote:


Comments:      There was a rapid and strong decrease in the period in the 
               range JD 482-484, with a clear negative Pdot 

                       Pdot = -72(8) x 10^{-5}
               and a mean Psh in that range of 0.05660(6) d.

               From JD .geq. 484, the period is fairly constant, with
                      Psh = 0.056093(9) d

               This is probably NOT a WZ-Sge type object, as the initial
               (very large) negative Pdot is quite unusual. It is more
               likely an SU UMa-type, with a rather large outburst


   This is stage A-B transition.  The period of stage B superhumps
is 0.05612(2) d, while that of stage A is 0.05694(10) d.
The difference in epsilon is 1.4%, which is fairly typical
difference in epsilon between stages A and B in WZ Sge-type
dwarf novae.   There is some hint of a positive Pdot for stage B.
Further observations are encouraged.

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