A Compact, Off-the-Shelf Low-Cost Dual Channel Photometer

Details A Compact, Off-the-Shelf Low-Cost Dual Channel Photometer A Compact, Off-the-Shelf Low-Cost Dual Channel Photometer

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sass...25...87s&link_type=abstract

The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23-25, 2006, at Big Bear, CA. Publish

Astronomy and Astrophysics

Astrophysics

Scientific paper

Photometric observations of short-period variable stars are time constrained because each basic observational sequence must be completed before the variable significantly changes its magnitude or color. A choice must be made. Should the scarce time within a sequence be devoted to making several observations in the same color band that, when combined, will significantly improve photometric precision over that of a single observation? Or, should the single observations be spread sequentially across color bands to provide both magnitude and color, thus enhancing astrophysical interpretations? A third alternative has occasionally been employed for many years, which is one of making a sequence of simultaneous observations in two or more color bands by using a dichroic beam splitter to partition the light into separate color bands with a separate detector being devoted to each band. The two-channel CCD photometer we describe can be operated in the Johnson-Cousins V and Ic bands simultaneously (or alternatively in B and Rc). The compact photometer, which can be assembled from off-the-shelf, low-cost components, uses a dichroic beam splitter (for V and Ic), a Meade flip mirror system, and two SBIG CCD cameras. Our preliminary results suggest that this doubling of observations has been made without any sacrifice in photometric precision.

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