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29 March 2024
 
  » arxiv » 1708.2290

 Article overview


Chemical Abundance Analysis of Three $alpha$-Poor, Metal-Poor Stars in the Ultra-Faint Dwarf Galaxy Horologium I
D. Q. Nagasawa ; J. L. Marshall ; J. D. Simon ; T. T. Hansen ; T. S. Li ; R. A. Bernstein ; E. Balbinot ; A. Drlica-Wagner ; A. B. Pace ; L. E. Strigari ; C. M. Pellegrino ; D. L. DePoy ; N. B. Suntzeff ; K. Bechtol ; T. M. C. Abbott ; F. B. Abdalla ; S. Allam ; J. Annis ; A. Benoit-Lévy ; E. Bertin ; D. Brooks ; A. Carnero Rosell ; M. Carrasco Kind ; J. Carretero ; C. E. Cunha ; C. B. D'Andrea ; L. N. da Costa ; C. Davis ; S. Desai ; P. Doel ; T. F. Eifler ; B. Flaugher ; P. Fosalba ; J. Frieman ; J. García-Bellido ; E. Gaztanaga ; D. W. Gerdes ; D. Gruen ; R. A. Gruendl ; J. Gschwend ; G. Gutierrez ; W. G. Hartley ; K. Honscheid ; D. J. James ; T. Jeltema ; E. Krause ; K. Kuehn ; S. Kuhlmann ; N. Kuropatkin ; M. March ; R. Miquel ; B. Nord ; A. Roodman ; E. Sanchez ; B. Santiago ; V. Scarpine ; R. Schindler ; M. Schubnell ; I. Sevilla-Noarbe ; M. Smith ; R. C. Smith ; M. Soares-Santos ; F. Sobreira ; E. Suchyta ; G. Tarle ; D. Thomas ; D. L. Tucker ; A. R. Walker ; R. H. Wechsler ; R. C. Wolf ; B. Yanny ;
Date 7 Aug 2017
AbstractWe 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 $alpha$-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 $alpha$-enhanced ([$alpha$/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.
Source arXiv, 1708.2290
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