[vsnet-chat 2005] Re: Correction: NY Ser humps

[Taichi Kato <tkato>]

Re: [vsnet-chat 2004] Re: Correction: NY Ser humps

> A nice fit. The period of 0.1037 is shorter than Taichi Kato
> mentions. I know that on VW Hydri the SH period shortens during the
> outburst but it's about 20 years since I took much interest in SH periods
> on SU UMa stars.

   I hope the very Nogami-san may have some comment on the previously
measureed superhump period of NY Ser.

   Superhump periods of textbook SU UMa stars decrease during superoutburst,
usually at a rate of Pdot/P = 10^{-6}.  However, recent observations indicate
some of short-period SU UMa stars show (best examples being SW UMa, V1028 Cyg,
AL Com, V485 Cen) positive Pdots.  The inferred period may be suggestive
of a negative Pdot (as in usual SU UMa stars), more observations and analysis
may be needed to verify the actually shortening.

Regards,
Taichi Kato

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