Chemical abundances in seven metal-poor H ii regions and a determination of the primordial helium abundance

Author:

Valerdi Mabel1ORCID,Peimbert Antonio1,Peimbert Manuel1

Affiliation:

1. Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264 Ciudad Universitaria, México

Abstract

ABSTRACT We conducted a long-slit spectrophotometry analysis to obtain the chemical abundances of seven metal-poor H ii regions in three galaxies: UM 160, UM 420, and TOL 0513−393. The data have been taken with the Focal Reducer Low Dispersion Spectrograph 1 (FORS1) at the 8.2-m Very Large Telescope. We derived the physical conditions and the chemical abundances of N, O, Ne, S, Ar, and Cl. We also performed a detailed analysis that involves abundance determinations using the t2 formalism. Based on He i recombination line intensity ratios, together with the {\sc HELIO 14} code, we derived the abundance of He. In addition, for a value $\Delta Y/\Delta Z_O \rm =3.3\pm 0.7$, we have estimated that the primordial helium abundance by mass is YP = 0.2448 ± 0.0033. This value agrees with values derived from Standard Big Bang Nucleosynthesis and with other recent determinations of YP.

Funder

DGAPA, UNAM

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 20 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Limits on non-relativistic matter during Big-bang nucleosynthesis;Journal of Cosmology and Astroparticle Physics;2024-07-01

2. Empirical calibration for helium abundance determinations in active galactic nuclei;Monthly Notices of the Royal Astronomical Society: Letters;2024-06-12

3. The 2024 BBN baryon abundance update;Journal of Cosmology and Astroparticle Physics;2024-06-01

4. Neutron lifetime anomaly and Big Bang nucleosynthesis;Canadian Journal of Physics;2024-02-01

5. A new precise determination of the primordial abundance of deuterium: measurement in the metal-poor sub-DLA system at z = 3.42 towards quasar J 1332+0052;Monthly Notices of the Royal Astronomical Society;2024-01-23

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3