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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood

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Bedell, Megan [1, 2] ; Bean, Jacob L. [1] ; Melendez, Jorge [3] ; Spina, Lorenzo [3, 4] ; Ramirez, Ivan [5] ; Asplund, Martin [6] ; Alves-Brito, Alan [7] ; dos Santos, Leonardo [3, 8] ; Dreizler, Stefan [9] ; Yong, David [6] ; Monroe, TalaWanda [10] ; Casagrande, Luca [6]
Número total de Autores: 12
Afiliação do(s) autor(es):
[1] Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 - USA
[2] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 - USA
[3] Univ Sao Paulo, Dept Astron IAG USP, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
[4] Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800 - Australia
[5] Tacoma Community Coll, 6501 South 19th St, Tacoma, WA 98466 - USA
[6] Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 2611 - Australia
[7] Univ Fed Rio Grande do Sul, Inst Fis, Av Bento Goncalves 9500, Porto Alegre, RS - Brazil
[8] Observ Univ Geneve, 51 Chemin Maillettes, CH-1290 Versoix - Switzerland
[9] Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen - Germany
[10] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 - USA
Número total de Afiliações: 10
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 865, n. 1 SEP 20 2018.
Citações Web of Science: 15

The compositions of stars are a critical diagnostic tool for many topics in astronomy such as the evolution of our Galaxy, the formation of planets, and the uniqueness of the Sun. Previous spectroscopic measurements indicate a large intrinsic variation in the elemental abundance patterns of stars with similar overall metal content. However, systematic errors arising from inaccuracies in stellar models are known to be a limiting factor in such studies, and thus it is uncertain to what extent the observed diversity of stellar abundance patterns is real. Here we report the abundances of 30 elements with precisions of 2% for 79 Sun-like stars within 100 pc. Systematic errors are minimized in this study by focusing on solar twin stars and performing a line-by-line differential analysis using high-resolution, high-signal-to-noise spectra. We resolve {[}X/Fe] abundance trends in galactic chemical evolution at precisions of 10-3 dex Gyr-1 and reveal that stars with similar ages and metallicities have nearly identical abundance patterns. Contrary to previous results, we find that the ratios of carbon-to-oxygen and magnesium-tosilicon in solar-metallicity stars are homogeneous to within 10% throughout the solar neighborhood, implying that exoplanets may exhibit much less compositional diversity than previously thought. Finally, we demonstrate that the Sun has a subtle deficiency in refractory material relative to > 80% of solar twins ( at 2s confidence), suggesting a possible signpost for planetary systems like our own. (AU)

Processo FAPESP: 14/15706-9 - Abundâncias diferenciais em estrelas de tipo solar: implicações sobre a formação de planetas e nucleossíntese estelar
Beneficiário:Lorenzo Spina
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 12/24392-2 - Espectroscopia de alta precisão: impacto no estudo de planetas, estrelas, a galáxia e cosmologia
Beneficiário:Jorge Luis Melendez Moreno
Linha de fomento: Auxílio à Pesquisa - Temático