A homogeneous comparison between the chemical composition of the Large Magellanic Cloud and the Sagittarius dwarf galaxy

Abstract

Similarities in the chemical composition of two of the closest Milky Way satellites, namely the Large Magellanic Cloud (LMC) and the Sagittarius (Sgr) dwarf galaxy, have been proposed in the literature, suggesting similar chemical enrichment histories between the two galaxies. This proposition, however, rests on different abundance analyses, which likely introduce various systematics that hamper a fair comparison among the different data sets. In order to bypass this issue (and highlight real similarities and differences between their abundance patterns), we present a homogeneous chemical analysis of 30 giant stars in LMC, 14 giant stars in Sgr and 14 giants in the Milky Way, based on high-resolution spectra taken with the spectrograph UVES-FLAMES. The LMC and Sgr stars, in the considered metallicity range ([Fe/H]>-1.1 dex), show very similar abundance ratios for almost all the elements, with differences only in the heavy s-process elements Ba, La and Nd, suggesting a different contribution by asymptotic giant branch stars. On the other hand, the two galaxies have chemical patterns clearly different from those measured in the Galactic stars, especially for the elements produced by massive stars. This finding suggests the massive stars contributed less to the chemical enrichment of these galaxies with respect to the Milky Way. The derived abundances support similar chemical enrichment histories for the LMC and Sgr.

21 pages, 8 figures, Accepted for publication by ApJ

References in corpus (22)

• The Gaia mission
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• A new implementation of the infrared flux method using the 2MASS catalogue
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• The exotic chemical composition of the Sagittarius dwarf Spheroidal galaxy
• Sulphur and zinc abundances in Galactic halo stars revisited
• The Chemical Enrichment History of the Large Magellanic Cloud
• The optimally-sampled galaxy-wide stellar initial mass function - Observational tests and the publicly available GalIMF code
• A Tail of Two Populations: Chemo-dynamics of the Sagittarius Stream and Implications for its Original Mass
• APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy
• Metallicity and $\alpha$-element Abundance Gradients along the Sagittarius Stream as Seen by APOGEE
• Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy
• The Alpha-element knee of the Sagittarius Stream
• Nucleosynthesis imprints from different Type Ia Supernova explosion scenarios and implications for galactic chemical evolution
• Zinc in the Sculptor dwarf spheroidal galaxy
• A Genetic Approach to the History of the Magellanic Clouds
• Abundances of disk and bulge giants from high-resolution optical spectra -- IV. Zr, La, Ce, Eu
• Tagging the Chemical Evolution History of the Large Magellanic Cloud Disk
• The chemical composition of the stellar cluster Gaia1: no surprise behind Sirius

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