Other
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1056s&link_type=abstract
Astronomical Journal, vol. 84, July 1979, p. 1056-1066.
Other
66
Astronomical Photography, Astronomical Photometry, Microdensitometers, Stellar Luminosity, Algorithms, Astronomical Catalogs, Data Acquisition, Density Distribution, Normal Density Functions, Open Clusters, Optical Scanners, Photographic Plates
Scientific paper
A technique for photographic stellar photometry with the PDS microdensitometer is described. It employs a least-squares fit to a model density profile to derive an instrumental magnitude index, an image-abnormality index, and the local value of the background density for each image. The instrumental magnitude index is calibrated in terms of true magnitude by the same methods as for iris photometry. A preliminary test of the method using plates of the open cluster NGC 188 indicates that a precision comparable to or slightly better than that of conventional iris photometry or other methods of PDS reduction may easily be attained. Possibilities for the future elaboration of the technique are mentioned.
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