Zinc in the Sculptor dwarf spheroidal galaxy

Abstract

From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have been made in $\approx$100 individual red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy. This is the largest sample of individual Zn abundance measurements within a stellar system beyond the Milky Way. In the observed metallicity range, $-2.7\le \text{[Fe/H]}\le -0.9$, the general trend of Zn abundances in Sculptor is similar to that of $\alpha$-elements. That is, super-solar abundance ratios of [Zn/Fe] at low metallicities, which decrease with increasing [Fe/H], eventually reaching subsolar values. However, at the higher metallicities in Sculptor, $\text{[Fe/H]}\gtrsim -1.8$, we find a significant scatter, $-0.8\lesssim \text{[Zn/Fe]}\lesssim +0.4$, which is not seen in any $\alpha$-element. Our results are consistent with previous observations of a limited number of stars in Sculptor and in other dwarf galaxies. These results suggest that zinc has a complex nucleosynthetic origin, behaving neither completely like an $\alpha$- nor an iron-peak element.

arXiv commentAccepted in A&A, 14 pages, 16 figures, 8 tables

References in corpus (58)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The observed properties of dwarf galaxies in and around the Local Group
• The Nucleosynthetic Signature of Population III
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• Elemental Abundance Survey of The Galactic Thick Disk
• Galactic chemical evolution: Carbon through Zinc
• Stellar Chemical Signatures And Hierarchical Galaxy Formation
• The Chemical Compositions of Galactic Disk F and G Dwarfs
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• The effective temperature scale of FGK stars. II. Teff : color : [Fe/H] calibrations
• One Hundred First Stars : Protostellar Evolution and the Final Masses
• Two distinct halo populations in the solar neighborhood. Evidence from stellar abundance ratios and kinematics
• Nucleosynthesis of Zinc and Iron-Peak Elements in Pop III Type II Supernovae : Comparison with abundances of Very Metal-Poor Halo Stars
• Abundance Patterns in the Draco, Sextans and Ursa Minor Dwarf Spheroidal Galaxies
• VLT/UVES Abundances in Four Nearby Dwarf Spheroidal Galaxies: I. Nucleosynthesis and Abundance Ratios
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• Protostellar Feedback Halts the Growth of the First Stars in the Universe
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• VLT/UVES Abundances in Four Nearby Dwarf Spheroidal Galaxies: II. Implications for Understanding Galaxy Evolution
• The exotic chemical composition of the Sagittarius dwarf Spheroidal galaxy
• A high resolution VLT/FLAMES study of individual stars in the centre of the Fornax dwarf spheroidal galaxy
• The Chemical Evolution of the Draco Dwarf Spheroidal Galaxy
• 'Sculptor'-ing the Galaxy? The Chemical Compositions of Red Giants in the Sculptor Dwarf Spheroidal Galaxy
• Binarity in Carbon-Enhanced Metal-Poor stars
• Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba
• The Star Formation & Chemical Evolution History of the Sculptor Dwarf Spheroidal Galaxy
• Chemical abundances of the Milky Way thick disk and stellar halo II.: sodium, iron-peak and neutron-capture elements
• Nucleosynthesis and the Inhomogeneous Chemical Evolution of the Carina Dwarf Galaxy
• Multi-Element Abundance Measurements from Medium-Resolution Spectra. I. The Sculptor Dwarf Spheroidal Galaxy
• The Chemical Evolution of the Ursa Minor Dwarf Spheroidal Galaxy
• Non-LTE Line-Formation and Abundances of Sulfur and Zinc in F, G, and K Stars
• Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy
• Limits on Pop III star formation with the most iron-poor stars
• Carbon-enhanced metal-poor stars in dwarf galaxies
• The Araucaria Project. The Distance to the Sculptor dwarf spheroidal galaxy from infrared photometry of RR Lyrae stars
• The extremely low-metallicity tail of the Sculptor dwarf spheroidal galaxy
• VLT/FLAMES spectroscopy of Red Giant Branch stars in the Carina dwarf spheroidal galaxy
• Sulphur abundances in disk stars: a correlation with silicon
• The first carbon-enhanced metal-poor star found in the Sculptor dwarf spheroidal
• Detailed Abundances of Two Very Metal-Poor Stars in Dwarf Galaxies
• The early days of the Sculptor dwarf spheroidal galaxy
• Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy
• Deep Wide-Field Imaging down to the oldest Main Sequence Turnoffs in the Sculptor dwarf spheroidal galaxy
• Explosion and nucleosynthesis of low redshift pair instability supernovae
• The AMBRE project: Iron-peak elements in the solar neighbourhood
• The Gaia-ESO Survey: Galactic evolution of sulphur and zinc
• Zinc abundances in Galactic bulge field red giants: implications for DLA systems
• The role of binaries in the enrichment of the early Galactic halo. I. r-process-enhanced metal-poor stars
• The chemistry of the most metal-rich damped Lyman $\alpha$ systems at z$\sim 2$ II. Context with the Local Group
• An inefficient dwarf: Chemical abundances and the evolution of the Ursa Minor dwarf spheroidal galaxy
• The Carina Project. VIII. The α-element abundances
• Enrichment of Heavy Elements in the red giant S15-19 in the Sextans Dwarf Spheroidal Galaxy
• Sulphur in the Sculptor dwarf spheroidal galaxy - Including NLTE corrections

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