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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.)

Discovery of a nitrogen-enhanced mildly metal-poor binary system: Possible evidence for pollution from an extinct AGB star

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Fernandez-Trincado, Jose G. [1, 2, 3] ; Mennickent, Ronald [1] ; Cabezas, Mauricio [4] ; Zamora, Olga [5, 6] ; Martell, Sarah L. [7, 8] ; Beers, Timothy C. [9, 10] ; Placco, Vinicius M. [9, 10] ; Nataf, David M. [11, 12] ; Meszaros, Szabolcs [13, 14] ; Minniti, Dante [15, 16, 17] ; Schleicher, Dominik R. G. [1] ; Tang, Baitian [18] ; Perez-Villegas, Angeles [19] ; Robin, Annie C. [3] ; Reyl, Celine [3]
Total Authors: 15
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[1] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion - Chile
[2] Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo - Chile
[3] Univ Bourgogne Franche Comte, Inst Utinam, UMR 6213, OSU THETA Franche Comte, Observ Besancon, CNRS, BP 1615, F-25010 Besancon - France
[4] Acad Sci Czech Republ, Astron Inst, Bocni 2 1401-1, Prague 14100 - Czech Republic
[5] Univ La Laguna, Dept Astrofis, E-38206 Tenerife - Spain
[6] Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205 - Spain
[7] Univ New South Wales, Sch Phys, Sydney, NSW 2052 - Australia
[8] Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW - Australia
[9] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 - USA
[10] Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 - USA
[11] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 - USA
[12] Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 - USA
[13] Eotvos Lorand Univ, Gothard Astrophys Observ, Szombathely - Hungary
[14] Hungarian Acad Sci, Budapest - Hungary
[15] Vatican Observ, V-00120 Vatican City - Vatican
[16] Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436 - Chile
[17] Univ Andres Bello, Fac Ciencias Exactas, Dept Cs Fis, Av Fernandez Concha 700, Santiago - Chile
[18] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082 - Peoples R China
[19] Univ Sao Paulo, IAG, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
Total Affiliations: 19
Document type: Journal article
Source: Astronomy & Astrophysics; v. 631, OCT 29 2019.
Web of Science Citations: 1

We report the serendipitous discovery of a nitrogen-rich, mildly metal-poor ({[}Fe/H] = -1.08) giant star in a single-lined spectroscopic binary system found in the SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) survey, Data Release 14 (DR14). Previous work has assumed that two percent of halo giants with unusual elemental abundances have been evaporated from globular clusters, but other origins for their abundance signatures, including binary mass transfer, must also be explored. We present the results of an abundance reanalysis of the APOGEE-2 high-resolution near-infrared spectrum of 2M12451043+1217401 with the Brussels Automatic Stellar Parameter (BACCHUS) automated spectral analysis code. We manually re-derive the main element families, namely light elements (C, N), elements (O, Mg, Si), the iron-peak element (Fe), s-process element (Ce), and light odd-Z element (Al). Our analysis confirms the N-rich nature of 2M12451043+1217401, which has a {[}N/Fe] ratio of +0.69, and shows that the abundances of C and Al are slightly discrepant from those of a typical mildly metal-poor red giant branch star, but exhibit Mg, Si, O and s-process abundances (Ce) of typical field stars. We also detect a particularly large variability in the radial velocity of this star over the period of the APOGEE-2 observations; the most likely orbit fit to the radial velocity data has a period of 730.89 +/- 106.86 days, a velocity semi-amplitude of 9.92 +/- 0.14 km s(-1), and an eccentricity of similar to 0.1276 +/- 0.1174. These data support the hypothesis of a binary companion, which has probably been polluted by a now-extinct asymptotic giant branch star. (AU)

FAPESP's process: 17/15893-1 - Globular cluster orbits of bulge: the formation and evolution of the Milky Way
Grantee:Maria de Los Angeles Perez Villegas
Support type: Scholarships in Brazil - Post-Doctorate