Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....34..401v&link_type=abstract
Astronomy and Astrophysics, vol. 34, no. 3, Sept. 1974, p. 401-408. In French.
Astronomy and Astrophysics
Astrophysics
4
Astronomical Photometry, Electrophotometers, Nebulae, Photomultiplier Tubes, Signal To Noise Ratios, Calibrating, Emission Spectra, Galactic Radiation, H Alpha Line, H Beta Line
Scientific paper
Description of the operating principle, optics, and electronics of a photometry system designed for the study of diffuse nebulae, and review of some of the observation results obtained with the aid of this system. The system measures quasi simultaneously, with only one photomultiplier, the luminous flux in two near spectral regions: one in the nebula line, the other in the continuum. Performed observations suggest that for rather bright nebulae the statistical noise is the most important, while for the faintest ones the parasitic sources of light become preponderant.
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