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

["William S G Walker" <astroman@voyager.co.nz>]

Greetings, All,

Excel has this nasty trick of plotting curves upside down from the
astronomical viewpoint - I've fallen into it with EX Hydrae where the light
curve is very sinusoidal at times.

Interesting to note that if you allow 19 cycles between Lew's two maxima my
maxima is predicted at June 19.440 +/- 0.01 whereas it seemed to be at
19.438. 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.

Regards,
Stan 



----------
> From: Lew Cook <lcoo@yahoo.com>
> To: Lew Cook <lcoo@yahoo.com>; vsnet-chat@kusastro.kyoto-u.ac.jp
> Subject: [vsnet-chat 2001] Correction: NY Ser humps 
> Date: Sunday, June 20, 1999 10:25 PM
> 
> Well, I got fooled by the Excel plot plotting the
> magnitude plot upside down - the maximum actually was
> about 
> June 20.27. the minimum was at June 20.24.
> Sorry for the confusion!
> --- Lew Cook <lcoo@yahoo.com> wrote:
> > Dear Colleagues:
> > 
> > From images taken June 20, 1999 from 0505UT to
> > 0815UT,
> > NY Ser continues to show superhumps but with reduced
> > amplitude. I show a minimum at June 20.24 and a
> maximum at June 20.27. The
> > following minimum is about 0.16 mag. fainter.
> > 
> > The prior set of data (June 18.3 UT) had an
> > amplitude
> > of ~0.25 magnitude.
> >  
> > Data from 314 images of 16 seconds each using a
> > CB245
> > camera with a clear filter on a 44 cm Newtonian was
> > binned in sets of 4.
> > ===
> > Regards, Lew 
> > - Visit http://home.pacbell.net/cookl 
> >
> _________________________________________________________
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> > 
> > 
> 
> ===
> Regards, Lew 
> - Visit http://home.pacbell.net/cookl 
> _________________________________________________________
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>

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