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The Ratio of Total to Selective Extinction from the Cluster Diameter Method

Published online by Cambridge University Press:  14 August 2015

Daniel H. Harris
Daniel H. Harris*
Affiliation:
Steward Observatory and Institute of Atmospheric Physics, University of Arizona, Ariz., U.S.A.

Abstract

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One hundred and fifty six open clusters with modern photometry, and apparent diameter measures by Trumpler, have been used to measure the mean ratio of total to selective extinction, R̄ It is found that cluster diameter is related to both concentration class and richness class. Diameter also seems to depend on the background stellar density and to decrease with reddening. With such effects measured and removed R̄ = 3.15 ± 0.20. This result is not significantly dependent on the cluster's position in space.

Type
Part I Extinction
Information
Symposium - International Astronomical Union , Volume 52: Interstellar Dust and Related Topics , 1973 , pp. 31 - 41
Copyright
Copyright © Reidel 1973 

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