Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...40..733m&link_type=abstract
Astrophysical Journal Supplement Series, vol. 40, Aug. 1979, p. 733-791.
Astronomy and Astrophysics
Astrophysics
231
Late Stars, Main Sequence Stars, Red Giant Stars, Stellar Evolution, Stellar Models, Abundance, Astronomical Catalogs, Graphs (Charts), Helium, Stellar Luminosity, Stellar Mass, Stellar Structure
Scientific paper
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.
Demarque Pierre
Gross Peter G.
Mengel John G.
Sweigart Allen V.
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