Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 models
Context: As a key to chemical evolutionary studies, the distribution of elements in galactic provides a wealth of information to understand the individual star formation histories of galaxies. The r-process is a complex nucleosynthesis process, and the origin of r-process elements is heavily debated...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
17 January 2025
|
| In: |
Astronomy and astrophysics
Year: 2025, Volume: 693, Pages: 1-8 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202451536 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202451536 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/01/aa51536-24/aa51536-24.html 
|
| Author Notes: | Yanjun Guo, Nicholas Storm, Maria Bergemann, Jianhui Lian, Sofya Alexeeva, Yangyang Li, Rana Ezzeddine, Jeffrey Gerber, and XueFei Chen |
MARC
| LEADER | 00000naa a2200000 c 4500 | ||
|---|---|---|---|
| 001 | 1933390131 | ||
| 003 | DE-627 | ||
| 005 | 20250818135204.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 250818s2025 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1051/0004-6361/202451536 |2 doi | |
| 035 | |a (DE-627)1933390131 | ||
| 035 | |a (DE-599)KXP1933390131 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rda | ||
| 041 | |a eng | ||
| 084 | |a 29 |2 sdnb | ||
| 100 | 1 | |a Guo, Yanjun |e VerfasserIn |0 (DE-588)1374133620 |0 (DE-627)1933392231 |4 aut | |
| 245 | 1 | 0 | |a Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 models |c Yanjun Guo, Nicholas Storm, Maria Bergemann, Jianhui Lian, Sofya Alexeeva, Yangyang Li, Rana Ezzeddine, Jeffrey Gerber, and XueFei Chen |
| 264 | 1 | |c 17 January 2025 | |
| 300 | |b Illustrationen | ||
| 300 | |a 8 | ||
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Gesehen am 18.08.2025 | ||
| 520 | |a Context: As a key to chemical evolutionary studies, the distribution of elements in galactic provides a wealth of information to understand the individual star formation histories of galaxies. The r-process is a complex nucleosynthesis process, and the origin of r-process elements is heavily debated. Europium (Eu) is viewed as an almost pure r-process element. Accurate measurements of europium abundances in cool stars are essential for an enhanced understanding of the r-process mechanisms. Aims: We measure the abundance of Eu in solar spectra and a sample of metal-poor stars in the Galactic halo and metal-poor disk, with the metallicities ranging from −2.4 to −0.5 dex, using non-local thermodynamic equilibrium (NLTE) line formation. We compare these measurements with Galactic Chemical Evolution (GCE) models to explore the impact of the NLTE corrections on the contribution of r-process site in Galactic chemical evolution. Methods: In this work, we used NLTE line formation, as well as one-dimensional (1D) hydrostatic and spatial averages of three-dimensional hydrodynamical (<3D>) model atmospheres to measure the abundance of Eu based on both the Eu II 4129 Å and Eu II 6645 Å lines for solar spectra and metal-poor stars. Results: We find that for Eu II 4129 Å line the NLTE modeling leads to higher (0.04 dex) solar Eu abundance in 1D and higher (0.07 dex) in <3D> NLTE while NLTE modeling leads to higher (0.01 dex) solar Eu abundance in 1D and lower (0.03 dex) in <3D> NLTE for Eu II 6645 Å line. Although the NLTE corrections for the Eu II λ 4129 Å and Eu II λ 6645 Å lines are opposite, the discrepancy between the abundances derived from these individual lines reduces after applying NLTE corrections, highlighting the critical role of NLTE abundance determinations. By comparing these measurements with Galactic chemical evolution (GCE) models, we find that the amount of NLTE correction does not require significant change of the parameters for Eu production in GCE models. | ||
| 700 | 1 | |a Storm, Nicholas |e VerfasserIn |0 (DE-588)1374134775 |0 (DE-627)1933394099 |4 aut | |
| 700 | 1 | |a Bergemann, Maria |d 1983- |e VerfasserIn |0 (DE-588)137055234 |0 (DE-627)589470515 |0 (DE-576)301526532 |4 aut | |
| 700 | 1 | |a Lian, Jianhui |e VerfasserIn |4 aut | |
| 700 | 1 | |a Alexeeva, Sofya |e VerfasserIn |4 aut | |
| 700 | 1 | |a Li, Yangyang |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ezzeddine, Rana |e VerfasserIn |4 aut | |
| 700 | 1 | |a Gerber, Jeffrey |e VerfasserIn |4 aut | |
| 700 | 1 | |a Chen, XueFei |e VerfasserIn |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Astronomy and astrophysics |d Les Ulis : EDP Sciences, 1969 |g 693(2025) vom: Jan., Artikel-ID A211, Seite 1-8 |h Online-Ressource |w (DE-627)253390222 |w (DE-600)1458466-9 |w (DE-576)072283351 |x 1432-0746 |7 nnas |a Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 models |
| 773 | 1 | 8 | |g volume:693 |g year:2025 |g month:01 |g elocationid:A211 |g pages:1-8 |g extent:8 |a Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 models |
| 856 | 4 | 0 | |u https://doi.org/10.1051/0004-6361/202451536 |x Verlag |x Resolving-System |z kostenfrei |3 Volltext |
| 856 | 4 | 0 | |u https://www.aanda.org/articles/aa/abs/2025/01/aa51536-24/aa51536-24.html |x Verlag |z kostenfrei |3 Volltext |
| 951 | |a AR | ||
| 992 | |a 20250818 | ||
| 993 | |a Article | ||
| 994 | |a 2025 | ||
| 998 | |g 137055234 |a Bergemann, Maria |m 137055234:Bergemann, Maria |d 130000 |e 130000PB137055234 |k 0/130000/ |p 3 | ||
| 998 | |g 1374134775 |a Storm, Nicholas |m 1374134775:Storm, Nicholas |d 130000 |e 130000PS1374134775 |k 0/130000/ |p 2 | ||
| 999 | |a KXP-PPN1933390131 |e 4758674108 | ||
| BIB | |a Y | ||
| SER | |a journal | ||
| JSO | |a {"id":{"eki":["1933390131"],"doi":["10.1051/0004-6361/202451536"]},"relHost":[{"id":{"eki":["253390222"],"issn":["1432-0746"],"zdb":["1458466-9"]},"pubHistory":["1.1969 -"],"recId":"253390222","name":{"displayForm":["European Southern Observatory (ESO)"]},"physDesc":[{"extent":"Online-Ressource"}],"language":["eng"],"note":["Gesehen am 21.06.2024","Erscheint 36mal jährlich in 12 Bänden zu je 3 Ausgaben","Fortsetzung der Druck-Ausgabe"],"origin":[{"dateIssuedKey":"1969","publisher":"EDP Sciences ; Springer","publisherPlace":"Les Ulis ; Berlin ; Heidelberg","dateIssuedDisp":"1969-"}],"titleAlt":[{"title":"Astronomy & astrophysics"},{"title":"a European journal"}],"title":[{"title_sort":"Astronomy and astrophysics","subtitle":"an international weekly journal","title":"Astronomy and astrophysics"}],"type":{"media":"Online-Ressource","bibl":"periodical"},"part":{"year":"2025","pages":"1-8","text":"693(2025) vom: Jan., Artikel-ID A211, Seite 1-8","extent":"8","volume":"693"},"corporate":[{"role":"isb","display":"European Southern Observatory"}],"disp":"Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 modelsAstronomy and astrophysics"}],"recId":"1933390131","physDesc":[{"noteIll":"Illustrationen","extent":"8 S."}],"name":{"displayForm":["Yanjun Guo, Nicholas Storm, Maria Bergemann, Jianhui Lian, Sofya Alexeeva, Yangyang Li, Rana Ezzeddine, Jeffrey Gerber, and XueFei Chen"]},"language":["eng"],"note":["Gesehen am 18.08.2025"],"origin":[{"dateIssuedKey":"2025","dateIssuedDisp":"17 January 2025"}],"title":[{"title_sort":"Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 models","title":"Non-local thermodynamic equilibrium (NLTE) abundances of europium (Eu) for a sample of metal-poor stars in the galactic halo and metal-poor disk with 1D and 〈3D〉 models"}],"type":{"media":"Online-Ressource","bibl":"article-journal"},"person":[{"family":"Guo","display":"Guo, Yanjun","role":"aut","given":"Yanjun"},{"display":"Storm, Nicholas","family":"Storm","role":"aut","given":"Nicholas"},{"display":"Bergemann, Maria","family":"Bergemann","given":"Maria","role":"aut"},{"display":"Lian, Jianhui","family":"Lian","given":"Jianhui","role":"aut"},{"display":"Alexeeva, Sofya","family":"Alexeeva","given":"Sofya","role":"aut"},{"family":"Li","display":"Li, Yangyang","given":"Yangyang","role":"aut"},{"given":"Rana","role":"aut","family":"Ezzeddine","display":"Ezzeddine, Rana"},{"display":"Gerber, Jeffrey","family":"Gerber","given":"Jeffrey","role":"aut"},{"family":"Chen","display":"Chen, XueFei","given":"XueFei","role":"aut"}]} | ||
| SRT | |a GUOYANJUNSNONLOCALTH1720 | ||