Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....74...54b&link_type=abstract
Astronomy and Astrophysics, vol. 74, no. 1, Apr. 1979, p. 54-56. Research supported by the Fonds National Suisse pour la Recherc
Astronomy and Astrophysics
Astrophysics
48
Stellar Spectrophotometry, Ubv Spectra, Computer Techniques, Minicomputers, Numerical Control, Reference Stars
Scientific paper
A differential photometer designed for observations in the Geneva seven-color photometric system is described which consists of a computer, a photon-counting photometer that can be controlled during measurements, and a mass storage unit. It is noted that the photometer can measure two objects simultaneously, that the angular velocity of the filter wheel is adjustable between 1 and 10 rps, and that the computer completely controls the electronic and mechanical operations of the instrument with the exception of telescope pointing. The instrument can operate differentially when comparing an unknown star with a reference star and can also be used in the star-sky mode, where the corresponding values are continuously compared.
Burnet Michel
Rufener F.
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