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A Scanning Micrometer with on-Line Computer

Published online by Cambridge University Press:  25 July 2018

Erik HøG
Erik HøG*
Affiliation:
Hamburger Sternwarte, Germany

Abstract

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A photoelectric scanning photometer is being tested at the 60 cm-refractor in Hamburg in order to measure visual binaries. The data-acquisition is accomplished by a small on-line computer PDP-8/S which samples data from three photon-counters connected to three narrow slits in the focal plane.

A preliminary investigation of the image profile as it is obtained from the adding of many scans of a star on top of each other shows that about 80% of the light is concentrated in a Gaussian core with σ = 1"-2" whereas the rest goes into non-Gaussian wings. The deviation of the profile from a single Gaussian is most pronounced in good seeing.

Type
First Session
Information
International Astronomical Union Colloquium , Volume 5: Coordination of Observing Techniques of Visual Double Stars , April 1971 , pp. 22 - 27
Copyright
Copyright © 1971

References

Franz, O. G.: 1966, Lowell Obs. Bull. No. 134.Google Scholar
Meinel, A. B.: 1960, ‘Astronomical Seeing and Observatory Site Selection', in Stars and Stellar Systems, I, Univ. of Chicago Press, 157, Chicago-London.Google Scholar
Rakos, K. D.: 1965, Appl. Opt. 4, 1453.Google Scholar