[vsnet-chat 3318] re NSV14667 = ASAS_J234131+0126.4

[no name <crawl@zoom.co.uk>]

Taichi Kato wrote:

> Another possible ROSAT identification with an ASAS variable.
> The period of 7.45d is long for a dK2 star (what type is expected?)

If you looked at the folded light curve on

http://archive.princeton.edu/cgi-asas/asas_variable/234131+0126.4,7.450892

you'd think Cepheid...

...but I think the very noisy and seriously gapped raw light curve tells
the true story...

[gapped data which has an increasing trend at one side and a declining
trend on the other can do this sort of trick.  I once made the same
mistake myself on a highly seasonal symbiotic star (I forget which one)
using visual data.  I got a very quasi-sinusoidal result!

Further, I've just PDMed the data from the website, and you can get a
pretty good 0.2 I amplitude folded curve of 1.152 day period of theta
statistic 0.58 (and by eye you can still "find" smaller ripples in
that!)]


Cheers

John

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