Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pasp...88..557b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 88, Aug. 1976, p. 557-560.
Astronomy and Astrophysics
Astronomy
107
Astronomical Photometry, Gallium Arsenides, Photomultiplier Tubes, Stellar Spectrophotometry, Ubv Spectra, Globular Clusters, Infrared Stars, Near Infrared Radiation, Optical Filters, Star Clusters
Scientific paper
A set of glass filters is described which, when used with a Ga-As photomultiplier, enables very satisfactory transformations to be made from instrumental UBVRI measures to existing UBV and VRI photometric systems. The construction of a liquid copper sulfate cell employed to prevent the red leak in UV filters is outlined, and the relative merits of different types of glass are discussed. It is concluded that the increased sensitivity of the infrared system makes it very attractive for observations of globular-cluster stars and faint cool field stars, although the situation for infrared standard stars still requires improvement.
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