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[vsnet-obs 19983] April 6, CCD, JLT

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PHOTOMETRIC CCD OBSERVATIONS OF VARIABLE STARS
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CENTER FOR BACKYARD ASTROPHYSICS  (CBA) DENMARK
Observer   :  Lasse Teist Jensen
Address     : Sdervej 38, DK - 8350 Hundslund , Denmark
E-mail        : ltj@cci.dk (at work)
                    : teist@image.dk (at home)
Phone      : (45) 86 55 02 13
CBA Denmark Page: http://vsnet.astro.columbia.edu/~cba/dk
Instruments:  0.25-m f/6.3 SCT , ST-6 SBIG CCD

Dear Colleagues,

Selected CCD results:

0000+00      V381 LAC   2451271.6013   1999-04-03   0.1013      14.9

0749+22      U GEM      2451273.3527   1999-04-04   0.8527      11.2
1409+19      T BOO      2451273.5395   1999-04-05   0.0395      <16.0
1556+33      VW CRB     2451273.5430   1999-04-05   0.0430      <17.2
1621+39      V844 HER   2451273.5444   1999-04-05   0.0444      <16.5

I have now reduced the time series I got on U Gem the night April 2-3.
An image showing U Gem and the resulting lightcurves can be found on the following page:

http://vsnet.image.dk/~teist/U%20Gem.htm

The U Gem lightcurve is shown in 2 versions. The first curve shows the full dataset.
In the second lightcurve I have omitted the last about 2 hours of the time series. The second lightcurve clearly shows the eclipse.
Comparison of the 2 versions of the lightcurve clearly shows the effect of observing too near the horizon in hazy weather. The last 2 hours of the time series are not useable due to the effect of the haze. In addition the moon had a strong effect during the last 2 hours.

I will soon reduce the U Gem time series I got the night April 4-5.

Regards 

Lasse Teist Jensen (JLT)

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