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7. Purpose and Requirements for Proper Motions of Faint Stars

Published online by Cambridge University Press:  02 August 2017

J. H. Oort

Extract

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These may be classed under four headings:

  • (a) Systematic motions at different points in space.

  • (b) Distribution of ‘random’ motions.

  • (c) Check on distances of faint stars as determined by spectrographic methods.

  • (d) Distances and motions of special types of stars.

Type
Part IV Symposia
Information
Transactions of the International Astronomical Union , Volume 8 , September 1954 , pp. 783 - 784
Copyright
Copyright © Cambridge University Press 1954