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An IUE survey of interstellar H I Ly alpha absorption. 1: Column densitiesWe measure Galactic interstellar neutral hydrogen column densities by analyzing archival interstellar Ly alpha absorption line data toward 554 B2 and hotter stars observed at high resolution with the IUE satellite. This study more than doubles the number of lines of sight with measures of N(H I) based on Ly alpha. We have included the scattered light background correction algorithm of Bianchi and Bohlin in our data reduction. We use the correlation between the Balmer discontinuity (c sub 1) index and the stellar Ly alpha absorption in order to assess the effects of stellar Ly alpha contamination. Approximately 40% of the B stars with measured (c sub 1) index, exhibit serious stellar Ly alpha contamination. One table contains the derived values of the interstellar N(H I) for 393 stars with at most small amounts of stellar contamination. Another lists the observed values of total N(H I) for 161 stars with suspected stellar Ly alpha contamination and/or uncertain stellar parameters.
Document ID
19950037095
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Diplas, Athanassios
(University of Wisconsin-Madison, Madison, WI United States)
Savage, Blair D.
(University of Wisconsin-Madison, Madison, WI United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1994
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 93
Issue: 1
ISSN: 0067-0049
Subject Category
Astrophysics
Accession Number
95A68694
Funding Number(s)
CONTRACT_GRANT: NAG5-1349
Distribution Limits
Public
Copyright
Other

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