The metallicity distribution in the core of the Sagittarus dwarf spheroidal: Minimising the metallicity biases

dc.contributor.authorMinelli, Alice
dc.contributor.authorBellazzini, Michele
dc.contributor.authorMucciarelli, Alessio
dc.contributor.authorBonifacio, Piercarlo
dc.contributor.authorIbata, Rodrigo
dc.contributor.authorRomano, Donatella
dc.contributor.authorMonaco, Lorenzo
dc.contributor.authorCaffau, Elisabetta
dc.contributor.authorDalessandro, Emanuele
dc.contributor.authorPascale, Raffaele
dc.date.accessioned2024-03-27T16:52:37Z
dc.date.available2024-03-27T16:52:37Z
dc.date.issued2023-01
dc.descriptionIndexación: Scopus.
dc.description.abstractWe present the metallicity and radial velocity for 450 bona fide members of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy, measured from high-resolution spectra (R ' 18 000) obtained with FLAMES at the VLT. The targets were carefully selected (a) to sample the core of the main body of Sgr dSph while avoiding contamination from the central stellar nucleus, and (b) to prevent any bias on the metallicity distribution by selecting targets based on their Gaia parallax and proper motions. All the targets selected in this way were confirmed as radial velocity members. We used this sample to derive the first metallicity distribution of the core of Sgr dSph, which is virtually unaffected by metallicity biases. The observed distribution ranges from [Fe=H] ≃-2:3 to [Fe=H] ≃0:0, with a strong, symmetric, and relatively narrow peak around [Fe=H] ' -0:5 and a weak and extended metal-poor tail, in which only 13:8 ±1:9% of the stars have [Fe=H] < -1:0. We confirm previous evidence of correlations between chemical and kinematical properties of stars in the core of Sgr. In our sample, stars with [Fe=H] ≥ -0:6 display a lower velocity dispersion and a higher rotation amplitude than those with [Fe=H] < -0:6, confirming previous suggestions of disk/halo structure for the progenitor of the system. © The Authors 2023.
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2023/01/aa44890-22/aa44890-22.html
dc.identifier.citationAstronomy and Astrophysics. Volume 669. 1 January 2023. Article number A54
dc.identifier.doi10.1051/0004-6361/202244890
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/55373
dc.publisherEDP Sciences
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGalaxies: dwarf
dc.subjectGalaxies: evolution
dc.subjectLocal Group
dc.subjectStars: abundances
dc.subjectTechniques: spectroscopic
dc.titleThe metallicity distribution in the core of the Sagittarus dwarf spheroidal: Minimising the metallicity biases
dc.typeArtículo
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