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Interstellar absorption along the line of sight to Sigma Scorpii using Copernicus observationsFrom Copernicus observations of Sigma Sco, 57 individual lines of 11 elements plus the molecular species H2 and CO were identified. By using a profile-fitting technique, rather than curves of growth, it was possible to obtain column densities and Doppler b values for up to four separate components along this line of sight. Electron density in the major H I component was derived from the photoionization equilibrium of sulfur, obtaining, n(e) of about 0.3/cu cm. The neutral hydrogen density in the same component was also derived using fine-structure excitation of O I. An H II component is also present in which the electron density was n(e) about 20/cu cm. As a by-product of this analysis, previously undetermined oscillator strengths for two Mn II lines were obtained: for 1162.-017 A, f about 0.023 and for 1164.211 A, f about 0.0086.
Document ID
19900048259
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Allen, M. M.
(Colorado Univ. Boulder, CO, United States)
Snow, T. P.
(Colorado, University Boulder, United States)
Jenkins, E. B.
(Princeton University Observatory, NJ, United States)
Date Acquired
August 14, 2013
Publication Date
May 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 355
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A35314
Funding Number(s)
CONTRACT_GRANT: NAS5-28731
Distribution Limits
Public
Copyright
Other

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