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On the abundance of EuropiumThe inclusion of the effects of hyperfine splitting can significantly lower the abundance estimate of Eu from singly ionized lines which lie on the flat portion of the curve of growth. In the 21 cool Ap stars studied by Adelman and the five Am stars studied by Smith, the Eu abundance was reduced by 0.4 dex on the average. In individual cases, the reductions were as great as 0.9 dex. This makes the Eu abundance comparable to that of its neighboring rare earths Sm and Gd in the Ap stars and less than Sm and Gd in the Am stars, but still substantially overabundant with respect to solar values.
Document ID
19740049203
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hartoog, M. R.
Cowley, C. R.
(Michigan, University Ann Arbor, Mich., United States)
Adelman, S. J.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
February 1, 1974
Publication Information
Publication: Astrophysical Journal
Volume: 187
Subject Category
Space Sciences
Accession Number
74A31953
Distribution Limits
Public
Copyright
Other

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