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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.)

J-PLUS: Identification of low-metallicity stars with artificial neural networks using SPHINX

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Author(s):
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Whitten, D. D. [1, 2] ; Placco, V. M. [1, 2] ; Beers, T. C. [1, 2] ; Chies-Santos, A. L. [3] ; Bonatto, C. [3] ; Varela, J. [4] ; Cristobal-Hornillos, D. [4] ; Ederoclite, A. [4] ; Masseron, T. [5, 6] ; Lee, Y. S. [7] ; Akras, S. [8] ; Borges Fernandes, M. [8] ; Caballero, J. A. [9] ; Cenarro, A. J. [4] ; Coelho, P. [10] ; Costa-Duarte, M. V. [10] ; Daflon, S. [8] ; Dupke, R. A. [11, 8, 12] ; Lopes de Oliveira, R. [13, 14, 15, 8] ; Lopez-Sanjuan, C. [4] ; Marin-Franch, A. [4] ; Mendes de Oliveira, C. [10] ; Moles, M. [16] ; Orsi, A. A. [16] ; Rossi, S. [10] ; Sodre, L. [10] ; Vazquez Ramio, H. [16]
Total Authors: 27
Affiliation:
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[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 - USA
[2] JINA Ctr Evolut Elements, E Lansing, MI 48824 - USA
[3] Univ Fed Rio Grande do Sul, Inst Fis, Dept Astron, Porto Alegre, RS - Brazil
[4] CSIC, CEFCA, Plaza San Juan, Planta 2, Teruel 44001 - Spain
[5] Univ La Laguna, Dept Astrofis, E-38206 Tenerife - Spain
[6] Inst Astrofis Canarias, Tenerife 38205 - Spain
[7] Chungnam Natl Univ, Dept Astron & Space Sci, Daejon 34134 - South Korea
[8] Observ Nacl MCTIC ON, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro - Brazil
[9] ESAC, INTA, CSIC, Ctr Astrobiol, Camino Bajo del Castillo S-N, Madrid 28692 - Spain
[10] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, Rua Matao 1226, BR-05508090 Sao Paulo - Brazil
[11] Univ Alabama, Dept Phys & Astron, Gallalee Hall, Tuscaloosa, AL 35401 - USA
[12] Univ Michigan, Dept Astron, 1085 S Ave Univ, Ann Arbor, MI 48109 - USA
[13] Univ Maryland Baltimore Cty, Dept Phys, 1000 Hilltop Circle, Baltimore, MD 21250 - USA
[14] Univ Fed Sergipe, Dept Fis, Ave Marechal Rondon S-N, BR-49000000 Sao Cristovao, SE - Brazil
[15] NASA Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 - USA
[16] CEFCA, Plaza San Juan 1, Teruel 44001 - Spain
Total Affiliations: 16
Document type: Journal article
Source: Astronomy & Astrophysics; v. 622, FEB 21 2019.
Web of Science Citations: 4
Abstract

Context. We present a new methodology for the estimation of stellar atmospheric parameters from narrow- and intermediate-band photometry of the Javalambre Photometric Local Universe Survey (J-PLUS), and propose a method for target pre-selection of low-metallicity stars for follow-up spectroscopic studies. Photometric metallicity estimates for stars in the globular cluster M15 are determined using this method. Aims. By development of a neural-network-based photometry pipeline, we aim to produce estimates of effective temperature, T-eff, and metallicity, {[}Fe/H], for a large subset of stars in the J-PLUS footprint. Methods. The Stellar Photometric Index Network Explorer, SPHINX, was developed to produce estimates of T-eff and {[}Fe/H], after training on a combination of J-PLUS photometric inputs and synthetic magnitudes computed for medium-resolution (R similar to 2000) spectra of the Sloan Digital Sky Survey. This methodology was applied to J-PLUS photometry of the globular cluster M15. Results. Effective temperature estimates made with J-PLUS Early Data Release photometry exhibit low scatter, sigma(T-eff) = 91 K, over the temperature range 4500 < T-eff (K) < 8500. For stars from the J-PLUS First Data Release with 4500 < T-eff (K) < 6200, 85 +/- 3% of stars known to have {[}Fe/H] < -2.0 are recovered by SPHINX. A mean metallicity of {[}Fe/H] = 2.32 +/- 0.01, with a residual spread of 0.3 dex, is determined for M15 using J-PLUS photometry of 664 likely cluster members. Conclusions. We confirm the performance of SPHINX within the ranges specified, and verify its utility as a stand-alone tool for photometric estimation of effective temperature and metallicity, and for pre-selection of metal-poor spectroscopic targets. (AU)

FAPESP's process: 14/18632-6 - The cosmic web described by superclusters of galaxies
Grantee:Marcus Vinícius Costa Duarte
Support Opportunities: Scholarships in Brazil - Post-Doctoral