The cosmic production of Helium

Details The cosmic production of Helium The cosmic production of Helium

2003-03-07

arxiv.org/abs/astro-ph/0303179v1

Science MAR7 (2003) 1552-1555

Astronomy and Astrophysics

Astrophysics

Published in Science Mar 7 2003: 1552-1555

Scientific paper

10.1126/science.1080866

We estimate the cosmic production rate of helium relative to metals ($\Delta Y/\Delta Z$) using K dwarf stars in the Hipparcos catalog with accurate spectroscopic metallicities. The best fitting value is $\Delta Y/\Delta Z=2.1 \pm 0.4$ at the 68% confidence level. Our derived value agrees with determinations from HII 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 insterstellar medium with fresh material.

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