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The Gaia-ESO Survey: Reevaluation of the parameters of the open cluster Trumpler 20 using photometry and spectroscopy

dc.contributor.authorDONATI, P.
dc.contributor.authorCANTAT-GAUDIN, T.
dc.contributor.authorBRAGAGLIA, A.
dc.contributor.authorFRIEL, E.
dc.contributor.authorMAGRINI, L.
dc.contributor.authorSMILJANIC, R.
dc.contributor.authorVALLENARI, A.
dc.contributor.authorTOSI, M.
dc.contributor.authorSORDO, R.
dc.contributor.authorTAUTVAIŠIENĖ, G.
hal.structure.identifierM2A 2014
dc.contributor.authorBLANCO-CUARESMA, S.
dc.contributor.authorCOSTADO, M. T.
dc.contributor.authorGEISLER, D.
dc.contributor.authorKLUTSCH, A.
dc.contributor.authorMOWLAVI, N.
dc.contributor.authorMUÑOZ, C.
dc.contributor.authorROMAN, I. San
dc.contributor.authorZAGGIA, S.
dc.contributor.authorGILMORE, G.
dc.contributor.authorRANDICH, S.
dc.contributor.authorBENSBY, T.
dc.contributor.authorFLACCOMIO, E.
dc.contributor.authorKOPOSOV, S. E.
hal.structure.identifierDepartment of Astronomy and Space Physics [Uppsala]
dc.contributor.authorKORN, A. J.
dc.contributor.authorPANCINO, E.
dc.contributor.authorRECIO-BLANCO, A.
dc.contributor.authorFRANCIOSINI, E.
dc.contributor.authorDE LAVERNY, P.
dc.contributor.authorLEWIS, J.
dc.contributor.authorMORBIDELLI, L.
dc.contributor.authorPRISINZANO, L.
dc.contributor.authorSACCO, G.
dc.contributor.authorWORLEY, C. C.
dc.contributor.authorHOURIHANE, A.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorJOFRE, P.
dc.contributor.authorLARDO, C.
dc.contributor.authorMAIORCA, E.
dc.date.created2013-12-17
dc.date.issued2014
dc.identifier.issn0004-6361
dc.description.abstractEnTrumpler 20 is an old open cluster (OC) located toward the Galactic centre, at about 3 kpc from the Sun and $\sim$7 kpc from the Galactic centre. Its position makes this cluster particularly interesting in the framework of the chemical properties of the Galactic disc because very few old OCs reside in the inner part of the disc. For this reason it has been selected as a cluster target of the Gaia-ESO Survey, and spectra of many stars in the main sequence and red clump phases are now available. Moreover, although it has been studied by several authors in the past, no consensus on the evolutionary status of Tr 20 has been reached. The heavy contamination of field stars (the line of sight of Tr 20 crosses the Carina spiral arm) complicates a correct interpretation. Another interesting aspect of the cluster is that it shows a broadened main-sequence turn-off and a prominent and extended red-clump, characteristics that are not easily explained by classical evolutionary models. Exploiting both spectroscopic information from the Gaia-ESO Survey (and the ESO archive) and literature photometry, we obtain a detailed and accurate analysis of the properties of the cluster. We make use of the first accurate metallicity measurement ever obtained from several spectra of red clump stars, and of cluster membership determination using radial velocities. According to the evolutionary models adopted, we find that Tr 20 has an age in the range 1.35-1.66 Gyr, an average reddening $E(B-V)$ in the range 0.31-0.35 mag, and a distance modulus $(m-M)_0$ between 12.64 and 12.72 mag. The spectroscopic metallicity is [Fe/H]=+0.17 dex. We discuss the structural properties of the object and constrain possible hypotheses for its broadened upper main sequence by estimating the effect of differential reddening and its extended red clump.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enThe Gaia-ESO Survey: Reevaluation of the parameters of the open cluster Trumpler 20 using photometry and spectroscopy
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201322911
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1312.3925
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A94
bordeaux.volume561
bordeaux.peerReviewedoui
hal.identifierhal-00974517
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00974517v1
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