[Aavso-photometry] HD37605 photometry/possible field variable

[Shawn Dvorak (RHO)]

I got a good run on HD37605 last night 03:13 to 06:55 UT.  The skies were quite transparent and probably as close to photometric as we can get here near sea level in Florida.  There was no sign of any change in HD37605 even at the few-millimag level.  This star is just about the perfect brightness for V filter photometry with my 25cm: I was able to go with 10sec images to avoid scintillation effects, but still collected plenty of photons.

While reducing the data I did notice that one of the comp/chk stars I used *may* be variable.  When plotting the brightness of the 86 comp against the 99 chk I see a sinusoidal curve with an amplitude of about 0.006 mag and a period around 0.08d (~2 hours).  Unfortunately there's no other stars bright enough in the field to provide a secondary check to see which of the two stars is variable (if either).  You can see a graph of the light curves at http://www.rollinghillsobs.org/images/HD37605_2004-12-26.jpg

Shawn Dvorak (DKS)
Clermont, FL