Red and Infrared Photometry of Double Stars

J. B. Breckinridge, Gerald E. Kron
1964 Publications of the Astronomical Society of the Pacific  
Observations and Reduction All programme stars including standard stars were observed with the standard RI filters of the Johnson system with a 20-arcsec diaphragm for 4 nights during the 1982-83 observing season. A photoelectric photometer attached to the 1.2 meter reflecting telescope of the Japal-Rangapur Observatory was used for these observations. A dry-ice cooled EMI 9558B photomultiplier tube was used as the detector and the photocurrent was recorded by means of a GR 1230A DC-amplifier
more » ... 230A DC-amplifier and a Honeywell Brown chart recorder.
doi:10.1086/128071 fatcat:lc4dozy5crfxphzpepanw7skfe