On the alpha-element gradients of the Galactic thin disk using Cepheids

Creators: Genovali, K.; Lemasle, Bertrand; da Silva, C. Correia; Bono, G.; Fabrizio, M.; Bergemann, M.; Buonanno, R.; Ferraro, I.; François, Patrick; Iannicola, G.; Inno, L.; Laney, C. D.; Kudritzki, Rolf-Peter; Matsunaga, N.; Nonino, M.; Primas, Francesca; Romaniello, M.; Urbaneja, M. A.; Thévenin, Frédéric

Others:: Dipartimento di Fisica, Universita di Roma Tor Vergata, via della Ricerca Scientifica 1, 00133, Rome, Italy; Astronomical Institute Anton Pannekoek, University of Amsterdam; INAF-Osservatorio Astronomico di Teramo; Max-Planck-Institut für Astronomie (MPIA); INAF-Osservatorio Astronomico di Roma (INAF-OAR); Galaxies, Etoiles, Physique, Instrumentation (GEPI) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS); Université de Picardie Jules Verne (UPJV); Department of Physics and Astronomy, Brigham Young University; Institute for Astronomy, University of Hawaii; Department of Astronomy, School of Science, University of Tokyo; INAF-Osservatorio Astronomico di Trieste (INAF-OATs); European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748, Garching bei Munchen, Germany; Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck; Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)

Description

We present new homogeneous measurements of Na, Al, and three alpha-elements (Mg, Si, Ca) for 75 Galactic Cepheids. The abundances are based on high spectral resolution (R~ 38 000) and high signal-to-noise ratio (S/N ~ 50-300) spectra collected with UVES at ESO VLT. The current measurements were complemented with Cepheid abundances provided by our group (75) or available in the literature, for a total of 439 Galactic Cepheids. Special attention was given to providing a homogeneous abundance scale for these five elements plus iron. In addition, accurate Galactocentric distances (R_G) based on near-infrared photometry are also available for all the Cepheids in the sample. They cover a large section of the Galactic thin disk (4.1

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On the alpha-element gradients of the Galactic thin disk using Cepheids

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