| Texto completo | |
| Autor(es): |
Placco, Vinicius M.
[1]
;
Roederer, Ian U.
[2, 3]
;
Lee, Young Sun
[4]
;
Almeida-Fernandes, Felipe
[5]
;
Herpich, Fabio R.
[5]
;
Perottoni, Helio D.
[5]
;
Schoenell, William
[6]
;
Ribeiro, Tiago
[7]
;
Kanaan, Antonio
[8]
Número total de Autores: 9
|
| Afiliação do(s) autor(es): | [1] NSFs NOIRLab, Community Sci & Data Ctr, 950 N Cherry Ave, Tucson, AZ 85719 - USA
[2] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 - USA
[3] JINA Ctr Evolut Elements, E Lansing, MI - USA
[4] Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon 34134 - South Korea
[5] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
[6] GMTO Corp, 465 N Halstead St, Suite 250, Pasadena, CA 91107 - USA
[7] Rubin Observ Project Off, 950 N Cherry Ave, Tucson, AZ 85719 - USA
[8] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC - Brazil
Número total de Afiliações: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Astrophysical Journal Letters; v. 912, n. 2 MAY 10 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
We report on the discovery of SPLUS J210428.01-004934.2, an ultra metal-poor (UMP) star first identified from the narrowband photometry of the Southern Photometric Local Universe Survey (S-PLUS) Data Release 1, in the SDSS Stripe 82 region. Follow-up medium- and high-resolution spectroscopy (with Gemini South and Magellan-Clay, respectively) confirmed the effectiveness of the search for low-metallicity stars using the S-PLUS narrowband photometry. At {[}Fe/H] = -4.03, SPLUS J2104-0049 has the lowest detected carbon abundance, A (C)=+4.34, when compared to the 34 previously known UMP stars in the literature, which is an important constraint on its stellar progenitor and also on stellar evolution models at the lowest metallicities. Based on its chemical abundance pattern, we speculate that SPLUS J2104-0049 could be a bona fide second-generation star, formed from a gas cloud polluted by a single metal-free similar to 30M(circle dot) star. This discovery opens the possibility of finding additional UMP stars directly from narrowband photometric surveys, a potentially powerful method to help complete the inventory of such peculiar objects in our Galaxy. (AU) | |
| Processo FAPESP: | 18/21661-9 - Catalogação de Fontes Variáveis e Ciência Tipo IFU em Levantamentos Fotométricos Multibanda. |
| Beneficiário: | Fábio Rafael Herpich |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/21250-9 - Identificação de estrelas brilhantes pobres em metais a partir de fotometria Multi-Banda e acompanhamento espectroscópico |
| Beneficiário: | Hélio Dotto Perottoni |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |