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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28187
Title: Atypical Mg-poor Milky Way Field Stars with Globular Cluster Second-generation-like Chemical Patterns
Authors: Fernández-Trincado, J. G.
Zamora, O.
García-Hernández, D. A.
Souto, Diogo
Dell'Agli, Flavia 
Schiavon, R. P.
Geisler, D.
Tang, B.
Villanova, S.
Hasselquist, Sten
Mennickent, R. E.
Cunha, Katia
Shetrone, M.
Allende Prieto, Carlos
Vieira, K.
Zasowski, G.
Sobeck, J.
Hayes, C. R.
Majewski, S. R.
Placco, V. M.
Beers, T. C.
Schleicher, D. R. G.
Robin, A. C.
Mészáros, Sz.
Masseron, T.
García Pérez, Ana E.
Anders, F.
Meza, A.
Alves-Brito, A.
CARRERA, JIMENEZ RICARDO JESUS 
Minniti, D.
Lane, R. R.
Fernández-Alvar, E.
Moreno, E.
Pichardo, B.
Pérez-Villegas, A.
Schultheis, M.
Roman-Lopes, A.
Fuentes, C. E.
Nitschelm, C.
Harding, P.
Bizyaev, D.
Pan, K.
Oravetz, D.
Simmons, A.
Ivans, Inese I.
Blanco-Cuaresma, S.
Hernández, J.
Alonso-García, J.
Valenzuela, O.
Chanamé, J.
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL LETTERS 
Number: 846
Issue: 1
First Page: L2
Abstract: We report the peculiar chemical abundance patterns of 11 atypical Milky Way (MW) field red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). These atypical giants exhibit strong Al and N enhancements accompanied by C and Mg depletions, strikingly similar to those observed in the so-called second-generation (SG) stars of globular clusters (GCs). Remarkably, we find low Mg abundances ([Mg/Fe] < 0.0) together with strong Al and N overabundances in the majority (5/7) of the metal-rich ([Fe/H] ≳ -1.0) sample stars, which is at odds with actual observations of SG stars in Galactic GCs of similar metallicities. This chemical pattern is unique and unprecedented among MW stars, posing urgent questions about its origin. These atypical stars could be former SG stars of dissolved GCs formed with intrinsically lower abundances of Mg and enriched Al (subsequently self-polluted by massive AGB stars) or the result of exotic binary systems. We speculate that the stars Mg-deficiency as well as the orbital properties suggest that they could have an extragalactic origin. This discovery should guide future dedicated spectroscopic searches of atypical stellar chemical patterns in our Galaxy, a fundamental step forward to understanding the Galactic formation and evolution.
URI: http://hdl.handle.net/20.500.12386/28187
URL: https://iopscience.iop.org/article/10.3847/2041-8213/aa8032
ISSN: 2041-8205
DOI: 10.3847/2041-8213/aa8032
Bibcode ADS: 2017ApJ...846L...2F
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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