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Published March 1967 | Published
Journal Article Open

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


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.

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.

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Published - 1967ApJ___147_1038S.pdf


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August 19, 2023
October 20, 2023