Volume 641, September 2020
|Number of page(s)||9|
|Published online||22 September 2020|
A wide angle view of the Sagittarius dwarf spheroidal galaxy
ESO – European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile
2 Max Planck Institute for Astronomy, Heidelberg, Königstuhl 17, 69117 Heidelberg, Germany
3 Departamento de Ciencias Fisicas, Universidad Andres Bello, Fernandez Concha 700, Las Condes, Santiago, Chile
4 INAF – Osservatorio Astronomico d’Abruzzo, Via Maggini snc, Teramo, Italy
5 INFN – Sezione di Perugia, Via A. Pascoli, Perugia, Italy
6 GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, 92195 Meudon, France
7 Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
8 Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Avenida Padre Hurtado 750, Viña del Mar 2520000, Chile
Accepted: 5 May 2020
We report on the discovery and chemical abundance analysis of the first CEMP-r/s star detected in the Sagittarius dwarf spheroidal galaxy (Sgr dSph) by means of UVES high-resolution spectra. The star, found in the outskirts of Sgr dSph, along the major axis of the main body, is a moderately metal-poor giant (Teff = 4753 K, log g = 1.75, [Fe/H] = −1.55) with [C/Fe] = 1.13, placing it in the so-called “high-carbon band”, and strong s-process and r-process enrichment ([Ba/Fe] = 1.4, [Eu/Fe] = 1.01). Abundances of 29 elements from C to Dy were obtained. The chemical pattern appears to be best fitted by a scenario where an r-process pollution event pre-enriched the material out of which the star was born as secondary in a binary system whose primary evolved through the AGB phase, providing C- and s-process enrichment.
Key words: galaxies: abundances / galaxies: individual: Sgr dSph / Galaxy: abundances / stars: abundances / stars: chemically peculiar
Line-by-line abundance tables are are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/641/A135
© ESO 2020
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