Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sass...26..119b&link_type=abstract
The Society for Astronomical Sciences 26th Annual Symposium on Telescope Science. Held May 22-24, 2007 at Big Bear, CA. Publishe
Astronomy and Astrophysics
Astronomy
Scientific paper
This paper describes a method of performing differential CCD photometry using multiple comparison stars. The instrumental magnitudes of the comparison stars (obtained for example using AIP4WIN v2) are used to compute a weighted mean zero point for each image. The contributions of individual comparison stars are weighted according to their errors. The zero point and its error are then used to derive magnitudes and error estimates for a target object and for each of the comparison stars in the image. Variants of the method may be used for filtered and unfiltered data and for using whatever information is available about the comparison stars. Examples are given of the results of these analyses. Potential advantages of using multiple comparison stars include reduced errors on derived magnitudes compared with using a single comparison star, detection of inaccuracies in comparison star magnitudes, and recognition of variability in comparison stars.
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