Abstract
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.
© 1982 Optical Society of America
Full Article | PDF ArticleMore Like This
Giuseppe A. De Biase, Lucio Paternò, Mauro Pucillo, and Giorgio Sedmak
Appl. Opt. 17(3) 435-441 (1978)
Thomas B. McCord
Appl. Opt. 7(3) 475-478 (1968)
J. C. Dainty, B. M. Levine, B. J. Brames, and K. A. O’Donnell
Appl. Opt. 21(7) 1196-1200 (1982)