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Stellar rings and galactic structure

Published online by Cambridge University Press:  14 August 2015

J. Isserstedt
J. Isserstedt*
Affiliation:
Astronomisches Institut, Ruhr-Universität, Bochum, Germany

Abstract

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Stellar rings are shell type prolate ellipsoidal stellar aggregates. The most important property is the constancy of the minor diameters which allows precise geometric distance determinations up to great distances. New photoelectric and photographic UBV-observations of two stellar rings confirm the reality and the diameter constancy of these objects. All A- and F-stars of a nearby ring in Aquila exhibit an UV-excess, similar to that observed in the very young open cluster NGC 2264.

Type
Part II/Observations of Spiral Structure in Our Galaxy
Information
Symposium - International Astronomical Union , Volume 38: The Spiral Structure of our Galaxy , 1970 , pp. 287 - 289
Copyright
Copyright © Reidel 1970 

References

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