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II. The Galaxy

Local structure and stellar motions

Published online by Cambridge University Press:  14 August 2015

N. G. Roman

Extract

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The region within about a kiloparsec of the sun contains no globular clusters, and few associations, planetary nebulae, novae, or Cepheids; the interpretation of 21-cm observations is complicated by peculiar motions which are comparable with galactic rotation effects. Nevertheless, this is an extremely important region for the study of galactic structure. Not only are all distance calibrations ultimately based on objects near the sun, but only in this region do we have the resolution necessary to examine the detail of galactic structure and only here can we study the numerous fainter members of the various stellar populations. As elsewhere, the problems are two-fold, the efficient selection of those objects whose study is the most informative and the choice of the methods of obtaining the greatest amount of information about those objects.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 7: Second Conference on co-ordination of Galactic Research , 1959 , pp. 65 - 80
Copyright
Copyright © Cambridge University Press 1959 

References

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