Abundance patterns of α and neutron-capture elements in the helmi stream

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dc.creatorLimberg, Guilherme
dc.creatorSantucci, Rafael Miloni
dc.creatorRossi, Silvia Cristina Fernandes
dc.creatorQueiroz, Anna Bárbara de Andrade
dc.creatorLeite, Cristina Chiappini Moraes
dc.creatorSouza, Stefano Oliveira de
dc.creatorPerottoni, Hélio Dotto
dc.creatorPerez Villegas, Maria de los Angeles
dc.creatorBarbosa, Fabrícia Oliveira
dc.date.accessioned2023-05-15T13:22:36Z
dc.date.available2023-05-15T13:22:36Z
dc.date.issued2021
dc.description.abstractWe identified eight additional stars as members of the Helmi stream (HStr) in the combined GALAH+ DR3 and Gaia EDR3 catalog. By consistently reevaluating claimed members from the literature, we consolidate a sample of 22 HStr stars with parameters determined from high-resolution spectroscopy and spanning a considerably wider (by ∼0.5 dex) metallicity interval (− 2.5  [Fe/H] < − 1.0) than previously reported. Our study focuses on α (Mg and Ca) and neutron-capture (Ba and Eu) elements. We find that the chemistry of HStr is typical of dwarf spheroidal (dSph) galaxies, in good agreement with previous N-body simulations of this merging event. Stars of HStr constitute a clear declining sequence in [α/Fe] for increasing metallicity up to [Fe/H] ∼ −1.0. Moreover, stars of HStr show a median value of +0.5 dex for [Eu/Fe] with a small dispersion (±0.1 dex). Every star analyzed with [Fe/H] < −1.2 belongs to the r-process enhanced ([Eu/Fe] > +0.3 and [Ba/Eu] < 0.0) metal-poor category, providing remarkable evidence that, at such a low-metallicity regime, stars of HStr experienced enrichment in neutron-capture elements predominantly via r-process nucleosynthesis. Finally, the extended metallicity range also suggests an increase in [Ba/Eu] for higher [Fe/H], in conformity with other surviving dwarf satellite galaxies of the Milky Way. Unified Astronomypt_BR
dc.identifier.citationLIMBERG, Guilherme et al. Abundance patterns of α and neutron-capture elements in the helmi stream. Astrophysical Journal Letters, Bristol, v. 913, n. 2, e28, 2021. DOI: 10.3847/2041-8213/ac0056. Disponível em: https://iopscience.iop.org/article/10.3847/2041-8213/ac0056.m. Acesso em: 11 maio 20.pt_BR
dc.identifier.doi10.3847/2041-8213/ac0056
dc.identifier.issn2041-8205
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/22532
dc.language.isoengpt_BR
dc.publisher.countryGra-bretanhapt_BR
dc.rightsAcesso Abertopt_BR
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleAbundance patterns of α and neutron-capture elements in the helmi streampt_BR
dc.typeArtigopt_BR

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