[vsnet-rr 23] Re: Delta Cep period analysis of visual observations

[Taichi Kato <tkato>]

Re: Delta Cep period analysis of visual observations

> Determining epochs by fitting visual measures to master light curves and
> then plotting on O-C diagrams shows just the lack of time resolution that
> you would expect. Visual measures with an accuracy of +/- 0.3 magnitudes
> produce epochs about 20-50 times less accurate than pep measures which are
> based on measures with accuracies of +/- 0.005 magnitudes.

   I have just placed GIF figures, PDM theta plot and phase-averaged light
curve (P=5.3660 d is used).  The phase bin in the latter figure is 0.02.
The figures look (at least) as pretty as our usual superhump analysis :-)
I have not yet done cross-correlation, but as inferred from the sharpness
of the ascending branch, the error in O-C would not exceed phase 0.02.

   http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/Cep/Delta_Cep/dceppdm.gif
   http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/Cep/Delta_Cep/dcepph.gif

Regards,
Taichi Kato

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