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The Correlation of Interstellar Reddening and Lα Absorption

Published online by Cambridge University Press:  14 August 2015

Edward B. Jenkins
Affiliation:
Princeton University Observatory, Princeton, N. J., U.S.A.
Blair D. Savage
Affiliation:
Space Astronomy Laboratory, Washburn Observatory, University of Wisconsin, Madison, Wis., U.S.A.

Abstract

For 61 stars whose interstellar Lα absorption was observed by OAO-2, the average relation of H I column density to B – V color excess is equal to 5 × 1021 atoms cm–2 mag–1. For a recent dust grain model this value implies that the density ratio 〈ρ HI/ρ dust〉 ≈ 100. A good correlation was found for deviations in the measurements of N HI and E(B – V) from their mean values expected over the distances to the different stars, indicating an association of H I gas with dust.

Type
Part V Distribution of Dust and Gas
Copyright
Copyright © Reidel 1973 

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