descriptionPublicationkeyboard_double_arrow_right Article , Other literature type , Preprint 07 Mar 2003Embargo end date: 01 Jan 2003 English Publisher:American Association for the Advancement of Science (AAAS)Journal:Science, volume 299, pages 1,552-1,555 (issn: 0036-8075, eissn: 1095-9203,

Copyright policy )Funded by:ARC | Calibrating Cosmology: Th..., ARC | The Chemistry of the Milk..., NSF | The Dark Matter Content o...

Authors: Jimenez, Raul; Flynn, Chris; MacDonald, James; Gibson, Brad K.;

doi: 10.1126/science.1080866 , 10.25916/sut.26245499.v1 , 10.25916/sut.26245499 , 10.48550/arxiv.astro-ph/0303179 , 10.25916/sut.26245499.v2

pmid: 12624260

arXiv: astro-ph/0303179

handle: 1959.3/1160

The Cosmic Production of Helium

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Abstract

We estimate the cosmic production rate of helium relative to metals (Δ Y/ Δ Z ) using K dwarf stars in the Hipparcos catalog with accurate spectroscopic metallicities. The best fitting value is Δ Y/ Δ Z = 2.1 ± 0.4 at the 68% confidence level. Our derived value agrees with determinations from H ii regions and with theoretical predictions from stellar yields with standard assumptions for the initial mass function. The amount of helium in stars determines how long they live and therefore how fast they will enrich the interstellar medium with fresh material.

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Keywords

Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics

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