A wide angle view of the Sagittarius dwarf spheroidal galaxy: II. A CEMP-r/s star in the Sagittarius dwarf spheroidal galaxy

L. Sbordone, C. J. Hansen, L. Monaco, S. Cristallo, P. Bonifacio, E. Caffau, S. Villanova, P. Amigo

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article numberA135
JournalAstronomy and Astrophysics
Volume641
DOIs
Publication statusPublished - 1 Sep 2020

Keywords

  • Galaxies: abundances
  • Galaxies: individual: Sgr dSph
  • Galaxy: abundances
  • Stars: abundances
  • Stars: chemically peculiar

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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