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Title:
Stellar evolution from the zero-age main sequence
Authors:
Mengel, J. G.; Demarque, P.; Sweigart, A. V.; Gross, P. G.
Affiliation:
AA(Yale University Observatory, New Haven Conn.), AB(Yale University Observatory, New Haven Conn.), AC(NASA, Goddard Space Flight Center, Greenbelt, Md; Yale University Observatory, New Haven, Conn.), AD(Warner and Swasey Observatory, East Cleveland, Ohio)
Publication:
Astrophysical Journal Supplement Series, vol. 40, Aug. 1979, p. 733-791. (ApJS Homepage)
Publication Date:
08/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Late Stars, Main Sequence Stars, Red Giant Stars, Stellar Evolution, Stellar Models, Abundance, Astronomical Catalogs, Graphs (Charts), Helium, Stellar Luminosity, Stellar Mass, Stellar Structure
DOI:
10.1086/190603
Bibliographic Code:
1979ApJS...40..733M

Abstract

A consistent set of 247 evolutionary sequences extending from the ZAMS to the red-giant branch is presented for Y from 0.10 to 0.40, Z from 0.00001 to 0.10, and masses of 0.55 to 6.90 solar masses. Each sequence is started from a homogeneous ZAMS model, and almost all are evolved to the base of the red-giant branch. It is shown that: (1) the relative position of the main sequence can be determined as a function of composition; (2) theoretical luminosity functions can be derived from the relative evolutionary time scales; (3) a dip in luminosity sometimes occurs at the base of the red-giant branch and is most pronounced at larger Z values; (4) metal-poor stars evolve farther up along the main sequence before turning off toward the red-giant branch; and (5) the onset of helium burning halts the evolution across the Hertzsprung gap for the most massive and most metal-poor models, so that the star remains blue during its phase of core-helium burning.

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