[vsnet-chat 2006] Re: Correction: NY Ser humps

[Lew Cook <lcoo@yahoo.com>]

Joe Patterson has several other sets of data and he
tells me that he has identified the superhump period
at 0.1042+-.0003 d.

Maybe he has a comment.

Regards, Lew

--- Taichi Kato <tkato@kusastro.kyoto-u.ac.jp> wrote:
> 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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