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Orion's cloak as a model for supershells of gas around OB associationsOrion OB1 was the association most heavily observed by the Copernicus satellite UV spectrometer, which detected very unusual, strong interstellar UV absorption lines. Negative velocity gas at -100 km/sec was also noted, together with the absence of a corresponding, very high positive velocity feature. These and other characteristics have led to the present inferrence of a radially expanding, thin, uniform and low column density shell of fast moving gas which surrounds the Ori OB1 and Lambda Ori regions. Inside this shell is a more slowly moving inhomogeneous region of higher density gas which produces the more sporadically distributed gas at velocities in the 30-100 km/sec range. Within this framework, it is suggested that the most recent supernova is seen in the highest velocity gas, while the composite effects of the history of supernova formation lie in the denser, slower material.
Document ID
19830058484
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cowie, L. L.
(MIT Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
October 15, 1982
Subject Category
Astrophysics
Accession Number
83A39702
Funding Number(s)
CONTRACT_GRANT: NAGW-308
CONTRACT_GRANT: NGL-22-009-638
CONTRACT_GRANT: NSG-7643
Distribution Limits
Public
Copyright
Other

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