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CCD observations of additional interstellar lines in stars associated with the Vela Remnant and Eta Carinae nebulosityNine stars from the Vela Remnant and seven stars in the Eta Carinae complex are examined with CCD spectrograms with high signal-to-noise ratios for data regarding the optical interstellar lines. These data are supplemented by observations of objects with known high-velocity components and substantial interstellar Ti II lines. The CCD spectrograms have signal-to-noise ratios of 100-300, a 2-pixel resolving power of 20,000, and cover features of Na I, Ti II, Ca I, CH(+), and CH in the 3200-4400-A range. The Ca I line confirms the high H density in Vela, and the Ti II lines show evidence of shock-induced grain evaporation. Weak shocks are thought to contribute to the CH(+) component, and a high H I density in some clouds is inferred from the CH line. The high H I density is supported by IUE data on Ca I and on the fine-structure carbon lines. The data point to a significant difference in spectroscopic morphology between the two groups of stars, and the need for theoretical support is underscored.
Document ID
19920046828
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wallerstein, George
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gilroy, Kalpana K.
(Washington, University Seattle, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Astronomical Journal
Volume: 103
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
92A29452
Funding Number(s)
CONTRACT_GRANT: NAG5-1443
Distribution Limits
Public
Copyright
Other

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