Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..305a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 305-308.
Astronomy and Astrophysics
Astrophysics
9
Globular Clusters, Stellar Evolution, Stellar Structure, Subgiant Stars, Stellar Atmospheres, Stellar Models, Stellar Temperature
Scientific paper
Four globular clusters whose color-magnitude diagrams show a gap on the subgiant branch are discussed. Standard stellar evolution theory does not predict the existence of a rapid phase of evolution at this point during a star's lifetime. A mechanism is outlined where this rapid evolutionary phase is attributed to the hydrogen-burning shell passing through a discontinuity in chemical composition. This discontinuity is set up by an ad-hoc mixing process. Evolutionary tracks constructed result in a gap crossing time a factor of two smaller than the standard model and almost identical evolution outside the gap. Another possibility, that the gap is caused by a rapid change in atmopsheric structure, is investigated by varying the mixing length in the convection zone. Tracks constructed in this manner are not consistent with the observed gaps.
Armandroff Taft E.
Demarque Pierre
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