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An r -process enhanced star in the dwarf galaxy Tucana III

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An r -process enhanced star in the dwarf galaxy Tucana III

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Título An r -process enhanced star in the dwarf galaxy Tucana III
Autor Hansen, Terese T.
Simon, Josh D.
Marshall, Jennifer L.
Li, T. S.
Carollo, Daniela
DePoy, Darren L.
Nagasawa, Daniel Q.
Bernstein, Rebecca A.
Drlica-Wagner, Alex
Abdalla, Filipe B.
Allam, Sahar S.
Annis, James T.
Bechtol, Keith
Benoit-Lévy, Aurélien
Brooks, D.
Buckley-Geer, Elizabeth
Carnero Rosell, Aurelio
Carrasco Kind, Matías
Carretero Palacios, Jorge
Cunha, Carlos Eduardo
Costa, Luiz N. da
Desai, S.
Eifler, Tim
Fausti Neto, Angelo
Flaugher, Brenna
Frieman, Joshua A.
García-Bellido, Juan
Gaztañaga, Enrique
Gerdes, David W.
Gruen, Daniel
Gruendl, Robert A.
Gschwend, Julia de Figueiredo
Gutierrez, Gaston R.
James, David J.
Krause, Elisabeth
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Miquel, Ramon
Plazas Malagón, Andrés Alejandro
Romer, Anita K.
Sanchez-Alvaro, Eusebio
Santiago, Basilio Xavier
Scarpine, Victor Emanuel
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Walker, Alistair
DES Collaboration
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 rprocess 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.
Contido em The astrophysical journal. Bristol. Vol. 838, no. 1 (Mar. 2017), 44, 11 p.
Assunto Captura radioativa de nêutrons
Composicao estelar
Metalicidade
Nucleosíntese
[en] galaxies: abundances
[en] Galaxies: dwarf
[en] Readable tables
[en] Stars: abundances
[en] Stars: chemically peculiar
[en] Supporting material: machine
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/165644
Arquivos Descrição Formato
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