Self-consistent stellar evolution models with applications to Milky Way globular clusters and population synthesis

Details Self-consistent stellar evolution models with applications to Milky Way globular clusters and population synthesis Self-consistent stellar evolution models with applications to Milky Way globular clusters and population synthesis

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt........17d&link_type=abstract

Proquest Dissertations And Theses 2007. Section 0059, Part 0606 196 pages; [Ph.D. dissertation].United States -- New Hampshire:

Astronomy and Astrophysics

Astronomy

2

Stellar Evolution, Milky Way, Globular Clusters

Scientific paper

The Dartmouth Stellar Evolution Program, a state of the art stellar evolution code, has been modified and expanded to increase its versatility. The modifications include: the ability to self-consistently model stars with arbitrary chemical composition, significant improvement in the modelling of very low mass stars, and expanded evolutionary coverage to include core and shell He burning. Models generated by DSEP are intended for general use by the astronomical community and may be obtained from the Dartmouth Stellar Evolution Database (http://stellar.dartmouth.edu/~models).
The models are confronted with tests from the mass-radius relation in stars less massive than the sun to the first observations of minimum mass stars in a globular cluster. These tests highlight both strengths and weakness in the models and suggest directions for future research.
New results are presented on the ages and chemical compositions of the stellar populations in the globular cluster M 54 (NGC 6715). It is believed to be the core of the Sagittarius dwarf elliptical galaxy currently being torn apart by the Milky Way. Finally, a study of the importance of individual chemical elements is presented. The study emphasizes the evolutionary effects of increasing the abundances of ten elements individually. These effects are combined with evolutionary population synthesis to demonstrate the importance of individual element abundances in studying the integrated light properties of distant galaxies.

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