Re: more GSC 748-1618

[Doug Welch <welch@physics.mcmaster.ca>]

Patrick,

I will try to dig up a few sample lightcurves with similar
periods to post. It is the case that these are not covered
in most references because they were only found in abundance
in the mid-90's. However, there are many of these beasts
in the LMC and SMC!

(The main reason that these were not picked up before is
their relatively low amplitudes - photographic surveys
would mis-identify them due to their low amplitudes - when
they found them at all!)

Cheers,
Doug

PS. I am not 100% sure that this is the correct identification
for this particular star. Even if it isn't, you should keep an
eye out for such stars in the TASS data - they are most likely
to show up near the galactic plane.

On Sat, 1 Mar 2003, Patrick Wils wrote:

> 
> --- Doug Welch <welch@physics.mcmaster.ca> wrote:
> > I am a little curious why people have decided to ignore
> > my suggestion that this is a short-period, overtone
> > Cepheid. Perhaps it wouldn't seem so strange then!
> 
> Yes, I agree now (I was quite sure it was an RR Lyrae star before, but
> it doesn't fit in either of the RRab or RRc class, so it can't be).  
> Aren't these overtone Cepheids always double mode pulsators ?  In that
> case a frequency analysis should reveal a second period of about 0.63
> days.
> 
> Patrick
>