Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..90..405f&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 90, no. 2, Feb. 1983, p. 405-419.
Astronomy and Astrophysics
Astrophysics
4
Astronomical Photography, Astronomical Photometry, Globular Clusters, Image Processing, Stellar Color, Stellar Magnitude, Calibrating, Data Reduction, Drift (Instrumentation), Image Resolution, Microdensitometers, Photographic Measurement
Scientific paper
Techniques for the reduction of photographic plates are presently compared, for the cases of three measuring machines: the Sartorius iris photometer of the Royal Greenwich Observatory, the GALAXY machine of the same observatory, and the PDS microdensitometer of the Naples and Trieste Observatories. The two plates in question, which are in the B and V, are of the globular cluster M15. The comparison has shown that while satisfactory results are obtainable by any of the three methods in the outer areas of globular clusters, the crowding of stellar images and the influence of the background density in the case of globular inner regions calls for the procedure applied to PDS scans of the plates.
Bingham Elizabeth A.
Buonanno Roberto
Corsi Carlo E.
Federici Luciana
Fusi Pecci Flavio
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