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      The GALAH survey: tracing the Galactic disc with open clusters

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          Open clusters are unique tracers of the history of our own Galaxy’s disc. According to our membership analysis based on Gaia astrometry, out of the 226 potential clusters falling in the footprint of the GALactic Archaeology with HERMES (GALAH) survey or the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey, we find that 205 have secure members that were observed by at least one of the surveys. Furthermore, members of 134 clusters have high-quality spectroscopic data that we use to determine their chemical composition. We leverage this information to study the chemical distribution throughout the Galactic disc of 21 elements, from C to Eu. The radial metallicity gradient obtained from our analysis is −0.076 ± 0.009 dex kpc−1, which is in agreement with previous works based on smaller samples. Furthermore, the gradient in the [Fe/H]–guiding radius (rguid) plane is −0.073 ± 0.008 dex kpc−1. We show consistently that open clusters trace the distribution of chemical elements throughout the Galactic disc differently than field stars. In particular, at the given radius, open clusters show an age–metallicity relation that has less scatter than field stars. As such scatter is often interpreted as an effect of radial migration, we suggest that these differences are due to the physical selection effect imposed by our Galaxy: clusters that would have migrated significantly also had higher chances to get destroyed. Finally, our results reveal trends in the [X/Fe]–rguid–age space, which are important to understand production rates of different elements as a function of space and time.

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          Most cited references149

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          Gaia Data Release 2

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              Galacti chemical evolution: Hygrogen through zinc


                Author and article information

                Monthly Notices of the Royal Astronomical Society
                Oxford University Press (OUP)
                May 2021
                March 31 2021
                May 2021
                March 31 2021
                February 18 2021
                : 503
                : 3
                : 3279-3296
                [1 ]School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
                [2 ]ARC Centre of Excellence for All Sky Astrophysics in Three Dimensions (ASTRO-3D), Australian National University, Canberra, ACT 0200, Australia
                [3 ]Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
                [4 ]Institute for Advanced Study, Princeton, NJ 08540, USA
                [5 ]Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
                [6 ]Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA
                [7 ]Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT 2611, Australia
                [8 ]Australian Astronomical Optics, Faculty of Science and Engineering, Macquarie University, Macquarie Park, NSW 2113, Australia
                [9 ]Macquarie University Research Centre for Astronomy, Astrophysics & Astrophotonics, Sydney, NSW 2109, Australia
                [10 ]Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
                [11 ]Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, Sydney, NSW 2006, Australia
                [12 ]Institut de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Martí i Franquès 1, E-08028 Barcelona, Spain
                [13 ]School of Physics, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia
                [14 ]Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str 1, D- 85741 Garching, Germany
                [15 ]School of Physical and Chemical Sciences, University of Canterbury, Christchurch 8041, New Zealand
                [16 ]Centre for Integrated Sustainability Analysis, The University of Sydney, Sydney, NSW 2006, Australia
                [17 ]Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
                [18 ]Department of Astronomy, AlbaNova University Centre, Stockholm University, SE-106 91 Stockholm, Sweden
                [19 ]Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia
                © 2021




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