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High-resolution sounding rocket observations of interstellar H2 lines toward Delta ScorpiiThe results of observations made with an far-ultraviolet echelle spectrograph on interstellar absorption lines from the Lyman system of H2 toward the B0.5 IV star Delta Scorpii are reported. Equivalent widths are used to derive a total H2 column density of 2.8 x 10 to the 19th/sq cm, and a kinetic temperature of 62 K is inferred from the population ratio of the J = 0 and J = 1 rotational states. An excitation temperature of 210 K for J levels between two and five gives constraints on the H2 formation rate and the loud volume density and implies that the local ultraviolet radiation field is roughly six times as intense as the average value in the solar neighborhood. It is shown that there is little or no systematic velocity separation among the excited rotational levels.
Document ID
19880041518
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Snow, Theodore P.
(Colorado Univ. Boulder, CO, United States)
Mcclintock, William E.
(Colorado Univ. Boulder, CO, United States)
Voels, Stephen A.
(Colorado, University Boulder, United States)
Date Acquired
August 13, 2013
Publication Date
February 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 325
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
88A28745
Funding Number(s)
CONTRACT_GRANT: NSG-5303
Distribution Limits
Public
Copyright
Other

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