Abstract
ABSTRACT A modification to the method of Fehrenbach for determination of stellar radial velocities from objective-prism plates is described which allows separation of members of discrete stellar systems from the surrounding field stars. The modified procedure, applied to the galactic globular star cluster NGC 3201, uses two objective-prism plates, with the direction of increasing wavelength reversed with respect to the sky orientation from one plate to the other. The use of a digital microdensitometer in the production of scanned spectral data is shown to be necessary in the further application of this method. Key words: star sclusters - radial velocity - objective prism
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