Helium-to-Metal Enrichment Ratio: Determinations on the Hertzsprung-Russel Diagram after Hipparcos

Details Helium-to-Metal Enrichment Ratio: Determinations on the Hertzsprung-Russel Diagram after Hipparcos Helium-to-Metal Enrichment Ratio: Determinations on the Hertzsprung-Russel Diagram after Hipparcos

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aard.conf..149f&link_type=abstract

ASTRONOMY AND ASTROPHYSICS Recent Developments. Proceedings of the 10th Portuguese Meeting. Held 27-28 July 2000 in CENTRA, Lisb

Astronomy and Astrophysics

Astrophysics

Scientific paper

The helium-to-metal enrichment, ΔY/ΔZ, can be determined using the interpretation of the observational Hertzsprung-Russel diagram (HRD) by means of theoretical stellar models. We emphasise two different approaches: the calibration of the helium for binary stellar systems and clusters with known metal abundance; and the observational main sequence spread for low mass stars. In this paper we resume the most recent results using these approaches with a particular attention to those based on HIPPARCOS parallaxes. The question of the ΔY/ΔZ unicity is briefly discussed.

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