Re: Error was GSC 748-1618 period

[Arne Henden <aah@nofs.navy.mil>]

What is the (V-I) for your comp star(s)?
An RR Lyr gets bluer at maximum than minimum; the TASS
data do not support that.  The (V-I) color is somewhat
outside the normal range of RR Lyrs as well, though the field
could be reddened (I haven't checked that).
   Your multiple night photometry also does not support
the Blazhko theory.  The Blazhko effect is a modulation
of the light curve, usually 40x or more longer than the
primary period.  Doug Welch has a nice movie of this
effect on one of the Macho RR Lyrae stars.  Michael K.'s
photometry has little amplitude scatter.
   I think the jury is still out as to the classification
of this star.
Arne

Michael Koppelman wrote:
> According to the TASS data, the average error in V on each night was:
> 
> 2452286    0.023
> 2452311    0.040
> 2452312    0.025
> 2452313    0.029
> 
> 311 is the night that seems like it might be cloudy or something.
> 
> I got some more data last night. I created a new plot where I binned my 
> data, added 0.01 error bars to my data and 0.03 error bars to the TASS 
> data. The new plot is here:
> 
> http://www.lolife.com/astronomy/gsc748-1618/7481618_phase_3.jpg
> 
> If I average the 3 periods that folks have been kind enough to send me, 
> we are still sitting at about 0.77737 days.
> 
> Yes, Arne, all my data is V band.
> 
> TASS V-I for the variable star:
> 
> Average 0.76
> Min     0.65
> Max     0.94
> Std Dev 0.06
> 
> Michael Koppelman
> 
> 
> 
>