Multiple population theory: The extreme helium population problem

Details Multiple population theory: The extreme helium population problem Multiple population theory: The extreme helium population problem

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..258..253y&link_type=abstract

The Ages of Stars, Proceedings of the International Astronomical Union, IAU Symposium, Volume 258, p. 253-264

Astronomy and Astrophysics

Astronomy

2

Stars: Abundances, Agb And Post-Agb, Chemically Peculiar, Evolution Hertzsprung-Russell Diagram, Population Ii, Galaxy: General, Abundances, Globular Clusters, Ism: Abundances

Scientific paper

The spreads in chemical abundances inferred by recent precision observations suggest that some or possibly all globular clusters can no longer be considered as simple stellar populations. The most striking case is ω Cen in the sense that its bluest main-sequence, despite its high metallicity, demands an extreme helium abundance of Y ≈ 0.4. I focus on this issue of “the extreme helium population problem” in this review.

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