Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975assl...54..159n&link_type=abstract
In: Image processing techniques in astronomy; Proceedings of the International Conference, Utrecht, Netherlands, March 25-27, 19
Astronomy and Astrophysics
Astronomy
1
Automation, Computer Techniques, Imaging Techniques, Photographic Plates, Signal Processing, Stellar Motions, Data Reduction, Microdensitometers, Milky Way Galaxy, Optical Scanners, Stellar Luminosity, Systems Engineering, Technology Assessment
Scientific paper
The present paper describes an automated system for measuring stellar proper motions on the basis of information contained in photographic plates. In this system, the images on a star plate are digitized by a scanning microdensitometer using light from a He-Ne gas laser, and a special-purpose computer arranges the measurements in computer-compatible form on magnetic tape. The scanning and image-reconstruction processes are briefly outlined, and the image-evaluation techniques are discussed. It is shown that the present system has been especially successful in measuring the proper motions of low-luminosity stars, including 119 stars with less than 1/10,000 of the solar bolometric luminosity. Plans for measurements of high-density Milky Way star plates are noted.
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