The Gaia-ESO Survey: Carbon Abundance in the Galactic Thin and Thick Disks

Mariagrazia Franchini, Carlo Morossi, Paolo Di Marcantonio, Miguel Chavez, Vardan Zh Adibekyan, Amelia Bayo, Thomas Bensby, Angela Bragaglia, Francesco Calura, Sonia Duffau, Anais Gonneau, Ulrike Heiter, Georges Kordopatis, Donatella Romano, Luca Sbordone, Rodolfo Smiljanic, Gražina Tautvaišienė, Mathieu Van Der Swaelmen, Elisa Delgado Mena, Gerry GilmoreSofia Randich, Giovanni Carraro, Anna Hourihane, Laura Magrini, Lorenzo Morbidelli, Sérgio Sousa, C. Clare Worley

    Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

    Sammanfattning

    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 med and IMG ALIGN="MIDDLE" ALT="$| {Z}-{\max }| $" SRC="apjab5dc4ieqn1.gif supports an "inside-out" and "upside-down" formation scenario for the disks of the Milky Way.

    Originalspråkengelska
    Artikelnummer55
    TidskriftAstrophysical Journal
    Volym888
    Nummer2
    DOI
    StatusPublished - 2020

    Ämnesklassifikation (UKÄ)

    • Astronomi, astrofysik och kosmologi

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