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The ultraviolet spectrum of Herbig-Haro object 2HIUE spectra of Herbig-Haro object 2H are presented. The spectra show a strong 'excess' UV continuum and prominent emission lines of C, N, O, Si, Mg, and possibly Al. The continuum, F(lambda), exhibits a turnover shortward of about 1450 A, confirming for the first time the H0 two-photon nature of the emission source. A possible absorption feature near 1680 A, which could result from a new grain or molecular constituent in these protostellar objects is also noted. Recently computed models of steady shocks into partially ionized gas reproduce the two-photon spectral shape, but its observed intensity relative to H-beta and the Balmer continuum is anomalously high. It is suggested that a range of shock velocities, 70-100 km/s, or nonsteady, 'truncated' shocks may be responsible. Future high-sensitivity UV observations of HH objects may be used to probe grain extinction curves in star-forming regions.
Document ID
19830033001
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Brugel, E. W.
(Colorado Univ. Boulder, CO, United States)
Seab, C. G.
(Colorado, University Boulder, CO, United States)
Shull, J. M.
(Colorado Univ. Boulder, CO, United States)
Date Acquired
August 11, 2013
Publication Date
November 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
83A14219
Funding Number(s)
CONTRACT_GRANT: NAS5-26409
CONTRACT_GRANT: NSF AST-80-19960
CONTRACT_GRANT: NAG5-193
Distribution Limits
Public
Copyright
Other

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