Physics
Scientific paper
Jul 1931
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1931natur.128...33f&link_type=abstract
Nature, Volume 128, Issue 3218, pp. 33 (1931).
Physics
Scientific paper
THE vast work of determining and cataloguing radial velocities has made the slitless spectrograph almost indispensable. A number of stars may then be photographed on the same plate at the same time. Such a method is possible only if the starlight passes through some medium which has sharp absorption lines so that the spectrum of each star has within it the absorption lines for references. A medium having sufficiently sharp lines in the proper spectral region does not seem to have been found. I would suggest the use of the crystals of the rare earths maintained at the temperature of liquid nitrogen. Both Dr. Joy, of the Mount Wilson Observatory, and Dr. Shane, of the University of California, have considered in this connexion the absorption spectra of crystals of gadolinium at room temperature.1 The absorption lines occur, however, in an unfavourable region of the spectrum.
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