Photographic measures of double stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Astronomical Photography, Binary Stars, Photographic Measurement, Position (Location), Tables (Data)

Scientific paper

Measurements of 20 double stars on 33 multiple-exposure plates obtained with the Van Vleck and Yale-Columbia refractors are presented. The majority of measurements were made with the Boller and Chivens PDS at the David Dunlap Observatory. The remainder, which provide a comparison, were made with the Strand Automatic Measuring Machine at the U.S. Naval Observatory. The results indicate that the DDO PDS is very well suited for this type of measurement.

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