The cosmic production of helium

被引：78
作者：
Jimenez, R [1 ]
Flynn, C
MacDonald, J
Gibson, BK
机构：
[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[2] Tuorla Observ, FIN-21500 Piikio, Finland
[3] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
[4] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
来源：
SCIENCE | 2003年 / 299卷 / 5612期
关键词：
D O I：
10.1126/science.1080866
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
We estimate the cosmic production rate of helium relative to metals (DeltaY/DeltaZ) using K dwarf stars in the Hipparcos catalog with accurate spectroscopic metallicities. The best fitting value is DeltaY/DeltaZ = 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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页码：1552 / 1555
页数：5
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