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For those interested, here are the UBVRI magnitudes for the companion (zero points from the Henden/Sumner sequence, which in turn was from only one photometric night, so the zero points on these can move a couple of hundredths): V B-V U-B V-R R-I 13.884 1.526 1.592 0.776 0.692 photometric error is also about 0.02mag for each magnitude/color except for U-B, which has a 0.06mag error. I'll adjust these values in a few days when I get more photometric data on the field. The companion is about 7arcsec west of the variable, so if you are using apertures larger than about 15arcsec diameter, you will be including the much of the companion in the aperture. For unfiltered or reddish filters, the companion currently contributes about half of the light in apertures that include both stars. For apertures smaller than 15arcsec, you will be just measuring the variable. It is those apertures near 15arcsec that will have the most problem, as you may or may not include the companion depending on the seeing and the quality of your centroiding when two equal-magnitude stars are near each other. Arne
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