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dc.contributor.author
Scannapieco, Cecilia  
dc.contributor.author
Cristina Chiappini  
dc.contributor.author
Gabriele Cescutti  
dc.date.available
2023-05-12T14:26:45Z  
dc.date.issued
2022-11  
dc.identifier.citation
Scannapieco, Cecilia; Cristina Chiappini; Gabriele Cescutti; The neutron-capture and α-elements abundance ratios scatter in old stellar populations: cosmological simulations of the stellar halo; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 516; 11-2022; 6075-6095  
dc.identifier.issn
0035-8711  
dc.identifier.uri
http://hdl.handle.net/11336/197314  
dc.description.abstract
We investigate the origin of the abundance ratios and scatter of the neutron-capture elements Sr, Ba, and Eu in the stellar halo of a Milky Way mass galaxy formed in a hydrodynamical cosmological simulation, and compare them with those of α elements. For this, we implement a novel treatment for chemical enrichment of Type II supernovae that considers the effects of the rotation of massive stars on the chemical yields and differential enrichment according to the life-times of progenitor stars. We find that differential enrichment has a significant impact on the early enrichment of the interstellar medium which is translated into broader element ratio distributions, particularly in the case of the oldest, most metal-poor stars. We find that the [element/Fe] ratios of the α-elements O, Mg, and Si have systematically lower scatter compared to the neutron-capture elements ratios Sr, Ba, and Eu at [Fe/H] < -2, which is ~0.1-0.4 dex for the former and between ~0.5 and 1 dex for the latter. The different scatter levels found for the neutron-capture and α-elements is consistent with observations of old stars in the Milky Way. Our model also predicts a high scatter for the [Sr/Ba] ratio, which results from the treatment of the fast-rotating stars and the dependence of the chemical yields on the metallicity, mass, and rotational velocities. Such chemical patterns appear naturally if the different ejection times associated with stars of different mass are properly described, without the need to invoke for additional mixing mechanisms or a distinct treatment of the α- and neutron-capture elements.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Wiley Blackwell Publishing, Inc  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
METHODS: NUMERICAL  
dc.subject
GALAXIES: ABUNDANCES  
dc.subject
GALAXIES: EVOLUTION  
dc.subject
GALAXIES: FORMATION  
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COSMOLOGY: THEORY  
dc.subject
ASTROPHYSICS - ASTROPHYSICS OF GALAXIES  
dc.subject.classification
Astronomía  
dc.subject.classification
Ciencias Físicas  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
The neutron-capture and α-elements abundance ratios scatter in old stellar populations: cosmological simulations of the stellar halo  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-05-11T13:30:19Z  
dc.journal.volume
516  
dc.journal.pagination
6075-6095  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Londres  
dc.description.fil
Fil: Scannapieco, Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina  
dc.description.fil
Fil: Cristina Chiappini. Leibniz Institut Fuer Astrophysik Potsdam; Alemania  
dc.description.fil
Fil: Gabriele Cescutti. Università degli Studi di Trieste; Italia  
dc.journal.title
Monthly Notices of the Royal Astronomical Society  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stac2581