[Aavso-photometry] Shortest period Variables..

[Shawn Dvorak]

Derek C Breit wrote:
> Can someone point me to a listing of currently visible (in California
> evenings) variables of the shortest periods???
>
> Or just suggest a handful???
>
> I successfully recorded the occultation of Pluto a couple nights ago, with
> it's 0.3 mag drop, and I wish to try other objects...
>
> If only I could limit the RHO ephemeris output to "shorter than 0.3 days"..
>
> :-)
>
> Derek
> www.poyntsource.com/New/index.htm
>  
>
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>   
Derek,

A few of my favorite short-period EBs are V523 Cas (p=0.23369, range 
10.6-11.5), XY Leo (p=0.2851, range 9.5-9.9), HW Vir (p=0.1167, range 
10.5-11.4), SW Lac (p=0.3207, range 8.5-9.4), and BX Peg (p=0.2804, 
range 11.0-11.7).  HW Vir is really neat since you can sometimes get 
three eclipses in a single night.  BX Peg, SW Lac, and V523 Cas are 
visible now, of course.

Don't forget the delta Scutids - they all have very short periods though 
their ranges are usually quite small.  The RHO site includes a page to 
generate ephem for delta Scutids and RR Lyrae stars, but the delta Scu 
stars have such short periods you can just point your CCD at them for 
2-3 hours and get a complete light curve.  Some of the delta Scutids 
with larger ranges (~0.2 - 0.5 mag) that would be visible now include CC 
And, GP And, RV Ari, and DE Lac.

I'll add the 'select a period range' feature to the wish list for the 
RHO ephem generator - it won't be too hard to implement but I may want 
to redo the interface to make new features easier to implement and use.

Shawn