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Chemical Abundance Analysis of Three $��$-Poor, Metal-Poor Stars in the Ultra-Faint Dwarf Galaxy Horologium I
- Publication Year :
- 2017
- Publisher :
- arXiv, 2017.
-
Abstract
- We present chemical abundance measurements of three stars in the ultra-faint dwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark Energy Survey. Using high resolution spectroscopic observations we measure the metallicity of the three stars as well as abundance ratios of several $��$-elements, iron-peak elements, and neutron-capture elements. The abundance pattern is relatively consistent among all three stars, which have a low average metallicity of [Fe/H] $\sim -2.6$ and are not $��$-enhanced ([$��$/Fe] $\sim 0.0$). This result is unexpected when compared to other low-metallicity stars in the Galactic halo and other ultra-faint dwarfs and hints at an entirely different mechanism for the enrichment of Hor I compared to other satellites. We discuss possible scenarios that could lead to this observed nucleosynthetic signature including extended star formation, a Population III supernova, and a possible association with the Large Magellanic Cloud.
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi...........9cf410ea1cb428fb835da89b4b6570f1
- Full Text :
- https://doi.org/10.48550/arxiv.1708.02290