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. doi:10.1086/149462. 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.
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| 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. | |||||||||
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| DOI: | 10.1086/149462 | |||||||||
| 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: | 16 Nov 2021 17:16 |
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