Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..35l..21m&link_type=abstract
Astrophysics and Space Science, vol. 35, June 1975, p. L21-L25.
Astronomy and Astrophysics
Astrophysics
Astronomical Photometry, Electronography, Image Tubes, Stellar Spectrophotometry, Globular Clusters, Photocathodes, Photographic Emulsions, Signal To Noise Ratios
Scientific paper
It is shown that the performance of spectracons is fairly close to the limit set by the photocathode. Image drift appears to be an as yet unresolved problem, at least in the particular tubes available to us. The emulsion characteristics make grain counting difficult to carry out, but for stellar spectra it proved possible to combine low densities with unwidened spectra. In this way one can shorten exposures appreciably compared to more conventional use of spectracons. For spectrophotometry G5 and not L4 is probably the best general purpose emulsion. At low densities the presence of dirt particles in emulsions limits their usefulness.
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