[Aavso-photometry] HD37605 photometry/possible field variable

[Arto.Oksanen at tietoenator.com]

And here in Finland I observed HD37605 from 21:08 to 00:22 UT on last night (Dec 27/28) when there was a gap between clouds. Seeing was bad and I had to defocus the telescope to be able to expose 30 seconds with V-filter without saturation, but the photometry from the fuzzy blobs turned out to be acceptable.

No apparent transit was detected, the star stayed at constant brighness (V=8.78) with STDEV of 0.007. 

I used the 109 comp star and neither the comp star or check star Shawn was using is on my field. Probably the 99 star is the varable as the variation is not present on the HD37605 on the light curve.  

best regards,

arto

--
Arto Oksanen                         arto.oksanen at jklsirius.fi
Jyvaskylan Sirius ry, Kyllikinkatu 1, FI-40100 Jyväskylä, Finland 
Tel: +358-40-5659438                         Fax: +358-14-4157803
Nyrola Observatory  http://www.ursa.fi/sirius/nytt/nytt_info.html 

-----Original Message-----
From: aavso-photometry-bounces at mira.aavso.org [mailto:aavso-photometry-bounces at mira.aavso.org] On Behalf Of Shawn Dvorak (RHO)
Sent: 28. joulukuuta 2004 6:28
To: aavso-photometry at mira.aavso.org
Subject: [Aavso-photometry] HD37605 photometry/possible field variable


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
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