[Aavso-photometry] Tu Cas - some random thoughts

[arne]

Michael Koppelman wrote:
> Thanks, Tim, very helpful.
> 
> I was using 25 second exposures last night in V. Haven't reduced the  
> data yet. I can get all three comp stars in the field. I had (yet  
> another) equipment problem so my run is only about 2.5 hours long. I  
> suspect with a period this long runs like mine may not have that much  
> value. I will be interested in seeing if there is microvariability.  
> Even if there is not, it might be fun to get very dense coverage and  
> get a high-quality light curve of the entire cycle a couple of times.  
> I'll wait for more learned minds to tell me if this is a waste of  time 
> or not. Because of my small (~6") scope I thought I'd adopt this  star 
> for the winter and see how it goes.
> 
Sounds like a perfect project for the 6-inch.  Noone has looked
at microvariability in cepheids to the best of my knowledge, though
I've taken time series personally without seeing anything.  One
part of the lightcurve to study closely is near minimum; all
pulsators seem to have less repeatability there and I wonder why.
   There are fainter comp stars in the field, and I've calibrated
them all.  The 3 comps were chosen primarily for the PEP folks,
but you can do ensemble with any set of stars you wish.  However,
Tim is correct in that this is a bright star, so the smaller
telescopes "win" for this project.
Arne