Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy

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dc.contributor.authorMucciarelli A.
dc.contributor.authorBellazzini M.
dc.contributor.authorIbata R.
dc.contributor.authorRomano D.
dc.contributor.authorChapman S.C.
dc.contributor.authorMonaco L.
dc.date.accessioned2024-04-01T13:12:56Z
dc.date.available2024-04-01T13:12:56Z
dc.date.issued2017-09
dc.descriptionIndexación: Scopus
dc.description.abstractWe present iron, magnesium, calcium, and titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9:00∼70 pc from the centre) from medium-resolution Keck/Deep Imaging Multi-Object Spectrograph spectra. All the considered stars belong to the massive globular cluster M 54 or to the central nucleus of the galaxy (Sgr, N). In particular we provide abundances for 109 stars with [Fe/H] ≥-1:0, more than doubling the available sample of spectroscopic metallicity and-elements abundance estimates for Sgr dSph stars in this metallicity regime.We find for the first time a metallicity gradient in the Sgr,N population, whose peak iron abundance goes from [Fe/H] =-0:38 for R ≤2:50 to [Fe/H] =-0:57 for 5:0 < R 9:0. On the other hand, the trends of [Mg/Fe], [Ca/Fe], and [Ti/Fe] with [Fe/H] are the same over the entire region explored by our study.We reproduce the observed chemical patterns of the Sagittarius dwarf spheroidal as a whole with a chemical evolution model which implies that a high mass progenitor (MDM = 6 1010 M) and a significant event of mass-stripping occurred a few Gyr ago, presumably starting at the first peri-Galactic passage after infall.
dc.description.urihttps://arxiv.org/abs/1705.03251
dc.identifier.citationAstronomy and Astrophysics Volume 6051 September 2017 Article number A46
dc.identifier.doi10.1051/0004-6361/201730707
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/55494
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.licenseCC BY 4.0 DEED Atribución 4.0 Internacional
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectGalaxies: Dwarf
dc.subjectGalaxies: Stellar content
dc.subjectLocal Group
dc.subjectStars: Abundances
dc.titleChemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy
dc.typeArtículo
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