Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/344947
Type: Artigo
Title: An r-process enhanced star in the dwarf galaxy Tucana III
Author: Hansen, T. T.
Simon, J. D.
Marshall, J. L.
Li, T. S.
Carollo, D.
DePoy, D. L.
Nagasawa, D. Q.
Bernstein, R. A.
Drlica-Wagner, A.
Abdalla, F. B.
Allam, S.
Annis, J.
Bechtol, K.
Benoit-Levy, A.
Brooks, D.
Buckley-Geer, E.
Rosell, A. C.
Kind, M. C.
Carretero, J.
Cunha, C. E.
da Costa, L. N.
Desai, S.
Eifler, T. F.
Neto, A. F.
Flaugher, B.
Frieman, J.
Garcia-Bellido, J.
Gaztanaga, E.
Gerdes, D. W.
Gruen, D.
Gruendl, R. A.
Gschwend, J.
Gutierrez, G.
James, D. J.
Krause, E.
Kuehn, K.
Kuropatkin, N.
Lahav, O.
Miquel, R.
Plazas, A. A.
Romer, A. K.
Sanchez, E.
Santiago, B.
Scarpine, V.
Smith, R. C.
Soares-Santos, M.
Sobreira, F.
Suchyta, E.
Swanson, M. E. C.
Tarle, G.
Walker, A. R.
Abstract: Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES. J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES. J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc. III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum. II. Comparison of the abundance pattern of DES. J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc. III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.
Subject: Galáxias anãs
Estrelas
Dwarf galaxies
Stars
Country: Estados Unidos
Editor: Institute of Physics Publishing
Rights: aberto
Identifier DOI: 10.3847/1538-4357/aa634a
Address: https://iopscience.iop.org/article/10.3847/1538-4357/aa634a/meta
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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