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The galactic distribution of young Cepheids

Published online by Cambridge University Press:  14 August 2015

G. A. Tammann
G. A. Tammann*
Affiliation:
Astronomisches Institut der Universität Basel, Binningen, Switzerland

Abstract

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The distribution of long-period Population I cepheids is studied. An age comparison of cepheids and galactic clusters shows that cepheids with periods > 11.25 d, corresponding to ages of ≲ 30 × 106 yr, should be almost as good spiral arm tracers as galactic clusters with earliest types b 2–3. The distances of cepheids are determined from a revised period-luminosity-colour relation and from colour excesses, for the determination of which a new, purely photometric method is given. The resulting distribution of cepheids shows a good correlation with the spiral arms, as traced by young clusters.

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. 236 - 245
Copyright
Copyright © Reidel 1970 

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