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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

SPLUS J210428.01-004934.2: An Ultra Metal-poor Star Identified from Narrowband Photometry

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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]
Total Authors: 9
[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
Total Affiliations: 8
Document type: Journal article
Source: Astrophysical Journal Letters; v. 912, n. 2 MAY 10 2021.
Web of Science Citations: 0

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)

FAPESP's process: 18/21661-9 - Cataloguing Variable Sources and IFU-like Science with Multiband Surveys.
Grantee:Fábio Rafael Herpich
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/21250-9 - Identification of bright ultra-metal-poor stars from Multi-Band photometry and spectroscopic follow-up
Grantee:Hélio Dotto Perottoni
Support type: Scholarships in Brazil - Post-Doctorate