Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975znpfk..20..113b&link_type=abstract
Zhurnal Nauchnoi i Prikladnoi Fotografii i Kinematografii, vol. 20, Mar.-Apr. 1975, p. 113-121. In Russian.
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Background Radiation, Photographic Plates, Stellar Luminosity, Stellar Radiation, Exposure, Optical Density, Photographic Film
Scientific paper
An astrosensitometer, which models stars against the sky background, was used to study the ability of photographic materials to record extremely weak stars. It was shown that increasing the exposure time when photographing stars is effective only until the optical density of the background reaches 0.7-1.0. Increasing the exposure time further, thereby further increasing the background optical density, does not make it possible to record weaker stars. It was found that with a given background brightness, some fine-grained, low-sensitivity photographic plates can record stars which are ten times fainter than coarse-grained, high-sensitivity plates can. The study showed that when the image diameters is decreased, the maximum sensitivity of the photographic material to stars also decreases.
Breido I. I.
Mikhailova O. M.
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