Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47...59c&link_type=abstract
Astronomy and Astrophysics, vol. 47, no. 1, Feb. 1976, p. 59-63.
Astronomy and Astrophysics
Astrophysics
2
Astronomical Photometry, Electrophotometry, H Ii Regions, Hydrogen Ions, Calibrating, Electronic Control, Nebulae, Optical Filters, Pointing Control Systems, Stellar Spectrophotometry
Scientific paper
The paper describes a photoelectric photometer which is used with interference filters for the measurement of line and continuum intensities in emission nebulae. An offset system allows accurate pointing and guiding. A preselected sequence of measurements using six filters is controlled by an electronic system, and the data (in the form of pulse counts) is recorded on punched tape. The filters are temperature-controlled. An accurate determination of the transmission characteristics of the filters is very important; some basic ideas are discussed here. The methods of measurement of nebulae and of calibration against standard stars, and the reduction principles, are then presented. A sample observation illustrates the problem of sky-background subtraction and shows the statistical characteristics of the photoncounting data.
Caplan James
Grec Gerard
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