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Analysis of F and G Subdwarfs. I. The Location of Subdwarfs in the Theoretical H-R Diagram

Strom, S. E. and Cohen, J. G. and Strom, K. M. (1967) Analysis of F and G Subdwarfs. I. The Location of Subdwarfs in the Theoretical H-R Diagram. Astrophysical Journal, 147 . pp. 1038-1049. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20190529-103831472

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Abstract

Spectrum scans and model stellar atmospheres have been used to locate in the (L/L_⊙, T_(eff)) plane F and G subdwarfs having known parallax A comparison is made between their position on the H-R diagram and the evolutionary tracks for Population II models of low- and high-helium content recently computed by Faulkner and Iben. The lower helium-content models are found to give somewhat more plausible ages than the high-helium models. Nevertheless, for both the low- and high-helium-content models, we find several subdwarfs with ages apparently greater than 10 X 10^9 years.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1086/149093DOIArticle
http://adsabs.harvard.edu/abs/1967ApJ...147.1038SADSArticle
ORCID:
AuthorORCID
Cohen, J. G.0000-0002-8039-4673
Additional Information:© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received August 10, 1966. We wish to thank Prof. Icko Iben for many valuable comments made in the course of several discussions and for supplying in advance of publication his and Faulkner’s Population II stellar models.
Record Number:CaltechAUTHORS:20190529-103831472
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190529-103831472
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95848
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 May 2019 21:43
Last Modified:03 Oct 2019 21:17

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