The Grant machine

Details The Grant machine The Grant machine

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975esob...12....5r&link_type=abstract

In its ESO Bull. No. 12 p 5-19 (SEE N76-12912 03-89)

Astronomy and Astrophysics

Astronomy

Comparators, Microdensitometers, Stellar Spectra, Astronomical Observatories, Chile, Data Acquisition, Data Reduction, Electronic Control, Europe, Hewlett-Packard Computers, Magnetic Storage, Radial Velocity, Spectrograms

Scientific paper

A Grant comparator microdensitometer in use at ESO is described. The device provides accurate measurements of the positions of stellar lines for radial velocity determinations and microdensitometry of the stellar spectrograms. The data acquisition and control system is based on an HP 2100 computer and can provide punched tape and magnetic tape recordings of the digitized output for both machine modes. There is also a stripchart recorder for manual measurement. The data are provided in a form convenient for further automatic processing. Speed and accuracy of spectral plate measurements are increased.

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