{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,5]],"date-time":"2025-11-05T21:02:10Z","timestamp":1762376530320},"reference-count":87,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2019,6,20]],"date-time":"2019-06-20T00:00:00Z","timestamp":1560988800000},"content-version":"vor","delay-in-days":19,"URL":"https:\/\/www.edpsciences.org\/en\/authors\/copyright-and-licensing"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2019,2,14]]},"published-print":{"date-parts":[[2019,6]]},"abstract":"<jats:p><jats:italic>Context<\/jats:italic>. Pismis 18 is a moderately populated, intermediate-age open cluster located within the solar circle at a Galactocentric distance of about seven kpc. Few open clusters have been studied in detail in the inner disc region before the <jats:italic>Gaia<\/jats:italic>-ESO Survey.<\/jats:p>\n<jats:p><jats:italic>Aims<\/jats:italic>. New data from the <jats:italic>Gaia<\/jats:italic>-ESO Survey allowed us to conduct an extended radial velocity membership study as well as spectroscopic metallicity and detailed chemical abundance measurements for this cluster.<\/jats:p>\n<jats:p><jats:italic>Methods<\/jats:italic>. <jats:italic>Gaia<\/jats:italic>-ESO Survey data for 142 potential members, lying on the upper main sequence and on the red clump, yielded radial velocity measurements, which, together with proper motion measurements from the <jats:italic>Gaia<\/jats:italic> Second Data Release (<jats:italic>Gaia<\/jats:italic> DR2), were used to determine the systemic velocity of the cluster and membership of individual stars. Photometry from <jats:italic>Gaia<\/jats:italic> DR2 was used to re-determine cluster parameters based on high confidence member stars only. Cluster abundance measurements of six radial-velocity member stars with UVES high-resolution spectroscopy are presented for 23 elements.<\/jats:p>\n<jats:p><jats:italic>Results<\/jats:italic>. The average radial velocity of 26 high confidence members is \u221227.5\u2005\u00b1\u20052.5\u2006(std)\u2006km s<jats:sup>\u22121<\/jats:sup> with an average proper motion of pmra\u2004=\u2004\u22125.65\u2005\u00b1\u20050.08 (std) mas yr<jats:sup>\u22121<\/jats:sup> and pmdec\u2004=\u2004\u22122.29\u2005\u00b1\u20050.11 (std) mas yr<jats:sup>\u22121<\/jats:sup>. According to the new estimates, based on high confidence members, Pismis 18 has an age of <jats:italic>\u03c4<\/jats:italic> = 700<jats:sup>+40<\/jats:sup><jats:sub>\u221250<\/jats:sub> Myr, interstellar reddening of <jats:italic>E<\/jats:italic>(<jats:italic>B<\/jats:italic> \u2212 <jats:italic>V<\/jats:italic>) = 0.562<jats:sup>+0.012<\/jats:sup><jats:sub>\u22120.026<\/jats:sub> mag and a de-reddened distance modulus of DM<jats:sub>0<\/jats:sub> = 11.96<jats:sup>+0.10<\/jats:sup><jats:sub>\u22120.24<\/jats:sub> mag. The median metallicity of the cluster (using the six UVES stars) is [Fe\/H]\u2004=\u2004+0.23\u2005\u00b1\u20050.05 dex, with [<jats:italic>\u03b1<\/jats:italic>\/Fe] = 0.07\u2005\u00b1\u20050.13 and a slight enhancement of <jats:italic>s<\/jats:italic>- and <jats:italic>r<\/jats:italic>-neutron-capture elements.<\/jats:p>\n<jats:p><jats:italic>Conclusions<\/jats:italic>. With the present work, we fully characterized the open cluster Pismis 18. We confirmed its present location in the inner disc. We estimated a younger age than the previous literature values and we gave, for the first time, its metallicity and its detailed abundances. Its [<jats:italic>\u03b1<\/jats:italic>\/Fe] and [<jats:italic>s<\/jats:italic>-process\/Fe], both slightly super-solar, are in agreement with other inner-disc open clusters observed by the <jats:italic>Gaia<\/jats:italic>-ESO survey.<\/jats:p>","DOI":"10.1051\/0004-6361\/201834636","type":"journal-article","created":{"date-parts":[[2019,4,4]],"date-time":"2019-04-04T18:51:38Z","timestamp":1554403898000},"page":"A90","source":"Crossref","is-referenced-by-count":15,"title":["The <i>Gaia<\/i>-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18"],"prefix":"10.1051","volume":"626","author":[{"given":"D.","family":"Hatzidimitriou","sequence":"first","affiliation":[]},{"given":"E. 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