Physics – Optics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apopt..21.2992m&link_type=abstract
Applied Optics, vol. 21, Aug. 15, 1982, p. 2992-2995.
Physics
Optics
12
Astronomical Observatories, Data Acquisition, Radiation Detectors, Stellar Spectrophotometry, Variable Stars, Bit Synchronization, Computer Techniques, Data Systems, Electronic Equipment, Sky Brightness, Transparence
Scientific paper
A new differential variable-star photometry system has been designed, constructed, and tested at the Rothney Astrophysical Observatory of the University of Calgary. The system uses a single telescope, photometer, and detector and consists of gated pulse-counting electronics synchronized to a chopped secondary mirror. The mirror is driven to four positions, permitting rapid alternate detection of a variable star, comparison star, and two sky-background regions. Within certain constraints the system is insensitive to the effects of transparency, sky-brightness, and detector-sensitivity variations occurring on time scales longer than the system's duty cycles. The system has proved effective under as much as three magnitudes of cloud and attendant sky-brightness variation.
Babott F. M.
Hansen C. H.
Milone Eugene F.
Robb Russell M.
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