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Analysis of F and G Subdwarfs. II. A Model-Atmosphere Abundance Analysis of the Subdwarfs HD 140283 and HD 19445

Cohen, Judith G. and Strom, Stephen E. (1968) Analysis of F and G Subdwarfs. II. A Model-Atmosphere Abundance Analysis of the Subdwarfs HD 140283 and HD 19445. Astrophysical Journal, 151 . pp. 623-636. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20190529-103831668

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Abstract

A grid of model atmospheres has been used to perform an abundance analysis of these two extreme Population II stars. The abundances determined from the models confirm the general results of previous investigations, namely that metals are deficient by a factor of about 100 relative to average Population I abundances. A marginal deficiency of s-process material relative to the average deficiency is found; the carbon deficiencies are comparable to those of the other elements and for HD 19445 the α-process elements are enhanced. From the analysis it also appears that convection plays a significant role in determining the temperature structure of subdwarf atmospheres.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1086/149462DOIArticle
http://adsabs.harvard.edu/abs/1968ApJ...151..623CADSArticle
ORCID:
AuthorORCID
Cohen, Judith G.0000-0002-8039-4673
Additional Information:© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received April 25, 1967; revised August 9, 1967. Part of this research was supported by contract NGR 22-024-001 from the National Aeronautics and Space Administration.
Funders:
Funding AgencyGrant Number
NASANGR 22-024-001
Record Number:CaltechAUTHORS:20190529-103831668
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190529-103831668
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95850
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 May 2019 21:58
Last Modified:03 Oct 2019 21:17

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