Zinc abundances in Galactic bulge field red giants: Implications for damped Lyman- α systems ∗ ∗ ∗

Vista sencilla de ítem
dc.contributor.authorBarbuy, B.
dc.contributor.authorFriaça, A.C.S.
dc.contributor.authorDa Silveira, C.R.
dc.contributor.authorHill, V.
dc.contributor.authorZoccali, M.
dc.contributor.authorMinniti, D.
dc.contributor.authorRenzini, A.
dc.contributor.authorOrtolani, S.
dc.contributor.authorGómez, A.
dc.date.accessioned2023-04-05T15:26:44Z
dc.date.available2023-04-05T15:26:44Z
dc.date.issued2015-08
dc.descriptionIndexación: Scopuses
dc.description.abstractContext. Zinc in stars is an important reference element because it is a proxy to Fe in studies of damped Lyman- systems (DLAs), permitting a comparison of chemical evolution histories of bulge stellar populations and DLAs. In terms of nucleosynthesis, it behaves as an alpha element because it is enhanced in metal-poor stars. Abundance studies in different stellar populations can give hints to the Zn production in different sites. Aims. The aim of this work is to derive the iron-peak element Zn abundances in 56 bulge giants from high resolution spectra. These results are compared with data from other bulge samples, as well as from disk and halo stars, and damped Lyman- systems, in order to better understand the chemical evolution in these environments. Methods. High-resolution spectra were obtained using FLAMES+UVES on the Very Large Telescope. We computed the Zn abundances using the Zn i lines at 4810.53 and 6362.34 We considered the strong depression in the continuum of the Zn i 6362.34 line, which is caused by the wings of the Ca i 6361.79 line suffering from autoionization. CN lines blending the Zn i 6362.34 A line are also included in the calculations. Results. We find [Zn/Fe] = +0.24 ?0.02 in the range a'1.3 < [Fe/H] < a'0.5 and [Zn/Fe] = +0.06 ?0.02 in the range a'0.5 < [Fe/H] < a'0.1, whereas for [Fe/H] ≥ a'0.1, it shows a spread of a'0.60 < [Zn/Fe] < +0.15, with most of these stars having low [Zn/Fe] < 0.0. These low zinc abundances at the high metallicity end of the bulge define a decreasing trend in [Zn/Fe] with increasing metallicities. A comparison with Zn abundances in DLA systems is presented, where a dust-depletion correction was applied for both Zn and Fe. When we take these corrections into account, the [Zn/Fe] vs. [Fe/H] of the DLAs fall in the same region as the thick disk and bulge stars. Finally, we present a chemical evolution model of Zn enrichment in massive spheroids, representing a typical classical bulge evolution. © 2015 ESO.es
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2015/08/aa25694-15/aa25694-15.html
dc.identifier.citationAstronomy and Astrophysics Volume 5801 August 2015 Article number A40es
dc.identifier.doi10.1051/0004-6361/201525694
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/48232
dc.language.isoenes
dc.publisherEDP Scienceses
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectAsymptotic Giant Branch Starses
dc.subjectIrones
dc.subjectDwarf Galaxieses
dc.titleZinc abundances in Galactic bulge field red giants: Implications for damped Lyman- α systems ∗ ∗ ∗es
dc.typeArtículoes
Archivos
Bloque original
Mostrando 1 - 1 de 1
No hay miniatura disponible
Nombre:
aa25694-15.pdf
Tamaño:
695.73 KB
Formato:
Adobe Portable Document Format
Descripción:
TEXTO EN INGLES
Descargar
Bloque de licencias
Mostrando 1 - 1 de 1
No hay miniatura disponible
Nombre:
license.txt
Tamaño:
1.71 KB
Formato:
Item-specific license agreed upon to submission
Descripción:
Descargar
Colecciones
FCE - Artículos de Revista