The cosmic production of helium
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posted on 2024-07-26, 14:32 authored by Raul Jimenez, Christopher FlynnChristopher Flynn, James MacDonald, Brad K. GibsonWe estimate the cosmic production rate of helium relative to metals (ΔY/ΔZ) using K dwarf stars in the Hipparcos catalog with accurate spectroscopic metallicities. The best fitting value is ΔY/ΔZ = 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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0036-8075Journal title
ScienceVolume
299Issue
5612Pagination
3 ppPublisher
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Copyright © 2003 The authors. The authors grant the American Association for the Advancement of Science exclusive rights to use and authorize use of their Work, however, they retain copyright in the Work as well as rights to make certain uses of the Work. The accepted manuscript is reproduced in accordance with this policy.Language
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