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An unusual absorption feature in the far ultraviolet spectrum of early type supergiantsThe OAO-2 satellite has been used to obtain far ultraviolet scans of six early-type supergiants. The data reveal the presence of a distinct, broad absorption feature centered near 1720 A. This feature is unique in that it remains essentially constant in strength, breadth and central position over the spectral type range B0 I to A2 I. The feature also appears in the spectrum of the B-type shell star beta Tauri, with a strength comparable to that observed for the supergiants. It appears weakly, or not at all, in the B and A main sequence spectra we have examined. The hypothesis that the feature is due to a fortuitous blend of intrinsically strong lines arising primarily from the ground configurations of abundant metallic ions is discussed in detail.
Document ID
19720024187
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Underhill, A. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Leckrone, D. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
West, D. K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: The Sci. Results from the Orbiting Astron. Obs. (OAO-2)
Subject Category
Space Sciences
Accession Number
72N31837
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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