Astrophysics of Galaxies · arXiv:2105.12260 v1 · submitted 25 May 2021
Chemical abundances in 7 metal-poor HII regions and a determination of the primordial helium abundance
The paper says
“In addition, for a value ΔY/ΔZO = 3.3 ± 0.7, we have estimated that the primordial helium abundance by mass is $Y_{\rm P}=0.2448\pm0.0033$.”
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Abstract
We conducted a long-slit spectrophotometry analysis to obtain the chemical abundances of seven metal-poor HII 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 HeI recombination line intensity ratios, together with the Helio14 code, we derived the abundance of He. In addition, for a value ΔY/ΔZO = 3.3 ± 0.7, we have estimated that the primordial helium abundance by mass is $Y_{\rm P}=0.2448\pm0.0033$. This value agrees with values derived from Standard Big Bang Nucleosynthesis and with other recent determinations of $Y_{\rm P}$.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 0.96
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.10 · human participants 0.02 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.97 · mentions code or data availability 0.03
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| We conducted a long-slit spectrophotometry analysis to obtain the chemical abundances of seven metal-poor HII regions in three galaxies: UM 160, UM 420, and TOL 0513-393. | contribution 0.87 | 0.98 | 0.03 | asserted 1.00 |
| The data have been taken with the Focal Reducer Low Dispersion Spectrograph 1 (FORS1) at the 8.2-m Very Large Telescope. | method 1.00 | 0.69 | 0.01 | asserted 1.00 |
| We derived the physical conditions and the chemical abundances of N, O, Ne, S, Ar, and Cl. | result 0.51 | 0.97 | 0.03 | asserted 1.00 |
| We also performed a detailed analysis that involves abundance determinations using the $t^2$ formalism. | method 0.94 | 0.96 | 0.03 | asserted 0.99 |
| Based on HeI recombination line intensity ratios, together with the Helio14 code, we derived the abundance of He. | method 0.94 | 0.97 | 0.05 | asserted 1.00 |
| In addition, for a value $\Delta Y/\Delta Z_O =3.3\pm 0.7$, we have estimated that the primordial helium abundance by mass is $Y_{\rm P}=0.2448\pm0.0033$. | result 1.00 | 0.95 | 0.78 | asserted 0.96 |
| This value agrees with values derived from Standard Big Bang Nucleosynthesis and with other recent determinations of $Y_{\rm P}$. | interpretation 0.95 | 0.41 | 0.26 | asserted 0.93 |
What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 1.00
What was examined, and what was not
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- arXiv listing abstract v1
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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,731 input tokens.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 2 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
How the literature uses it
7 arXiv papers cite this in 10 sentences
Papers citing it · 6 sentences without a confident label
Uses its data or values 2 papers
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which are based on various measurements from several groups for helium-4 [ref] , and primarily on [ref] for deuterium.
Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look · Methodology · 0.92
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The PDG average [ref] of the current measurements [ref] is [equation] Not included in the above average is a very recent result from the Subaru Telescope [ref] , which is obtained from 10 extra-metal-poor galaxies.
Neutron Lifetime Anomaly and Big Bang Nucleosynthesis · BBN Abundances · 0.96
Cites it as background 2 papers
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The successful concordance between big bang nucleosynthesis (BBN) [ref] , the observational determination of the light elements D/H [ref] , and 4 [ref] , and observations of the cosmic microwave background (CMB) anisotropies [ref] is one of the foundations of early universe big bang cosmology.
Limits on Non-Relativistic Matter During Big-Bang Nucleosynthesis · Introduction · 0.98
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The helium abundance is frequently derived using several emission lines in the optical and NIR wavelength ranges [ref] .
An Empirical Calibration of the Helium Abundance in HII Regions based in Literature and CALIFA Survey data · Helium abundances He$^+$/H$^+$ in the literature · 0.98
What it cites · 1 sentence without a confident label
Compares with 1 paper
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Moreover, our result of the neutron mean lifetime, together with the results obtained from previous works [ref] , are within $1σ$ from the value $τ_n=879.4±0.6$s presented by the [ref] from laboratory determinations.
Improving Helium Abundance Determinations with Leo P as a Case Study · Primordial helium abundance · 0.93
Cites as background 2 papers
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Other recent determinations of the primordial helium abundances using HII regions have been done by [ref] .
Improving Helium Abundance Determinations with Leo P as a Case Study · Introduction · 0.95
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A historical review on the determination of the primordial helium abundance was presented by [ref] .
The Primordial Helium Abundance · Introduction · 1.00
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