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http://hdl.handle.net/20.500.12386/31675
Title: | The Gaia-ESO Survey: Carbon Abundance in the Galactic Thin and Thick Disks | Authors: | FRANCHINI, Mariagrazia MOROSSI, Carlo DI MARCANTONIO, Paolo Chavez, Miguel Adibekyan, Vardan Zh. Bayo, Amelia Bensby, Thomas BRAGAGLIA, Angela CALURA, Francesco Duffau, Sonia Gonneau, Anais Heiter, Ulrike Kordopatis, Georges ROMANO, Donatella Sbordone, Luca Smiljanic, Rodolfo Tautvaišienė, Gražina VAN DER SWAELMEN, MATHIEU BENOIT JEAN Delgado Mena, Elisa Gilmore, Gerry RANDICH, Maria Sofia Carraro, Giovanni Hourihane, Anna MAGRINI, LAURA MORBIDELLI, LORENZO Sousa, Sérgio Worley, C. Clare |
Issue Date: | 2020 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 888 | Issue: | 2 | First Page: | 55 | Abstract: | This paper focuses on carbon, which is one of the most abundant elements in the universe and is of high importance in the field of nucleosynthesis and galactic and stellar evolution. The origin of carbon and the relative importance of massive and low- to intermediate-mass stars in producing it is still a matter of debate. We aim at better understanding the origin of carbon by studying the trends of [C/H], [C/Fe], and [C/Mg] versus [Fe/H] and [Mg/H] for 2133 FGK dwarf stars from the fifth Gaia-ESO Survey internal data release (GES iDR5). The availability of accurate parallaxes and proper motions from Gaia DR2 and radial velocities from GES iDR5 allows us to compute Galactic velocities, orbits, absolute magnitudes, and, for 1751 stars, Bayesian-derived ages. Three different selection methodologies have been adopted to discriminate between thin- and thick-disk stars. In all the cases, the two stellar groups show different [C/H], [C/Fe], and [C/Mg] and span different age intervals, with the thick-disk stars being, on average, older than the thin-disk ones. The behaviors of [C/H], [C/Fe], and [C/Mg] versus [Fe/H], [Mg/H], and age all suggest that C is primarily produced in massive stars. The increase of [C/Mg] for young thin-disk stars indicates a contribution from low-mass stars or the increased C production from massive stars at high metallicities due to the enhanced mass loss. The analysis of the orbital parameters R <SUB>med</SUB> and | {Z}<SUB>\max </SUB>| supports an “inside-out” and “upside-down” formation scenario for the disks of the Milky Way. <P />Based on observations collected with the FLAMES instrument at VLT/UT2 (Paranal Observatory, ESO, Chile), for the Gaia-ESO Large Public Spectroscopic Survey (188.B-3002, 193.B-0936). | URI: | http://hdl.handle.net/20.500.12386/31675 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab5dc4 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab5dc4 | Bibcode ADS: | 2020ApJ...888...55F | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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1911.13132.pdf | preprint | 2.85 MB | Adobe PDF | View/Open |
Franchini_2020_ApJ_888_55.pdf | [Administrators only] | 2.19 MB | Adobe PDF |
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