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dc.rights.license© ESO 2019-
dc.contributor.authorPrisinzano, L.-
dc.contributor.authorDamiani, F.-
dc.contributor.authorKalari, V.-
dc.contributor.authorJeffries, R. D.-
dc.contributor.authorBonito, R.-
dc.contributor.authorMicela, G.-
dc.contributor.authorWright, N. James-
dc.contributor.authorJackson, R. J.-
dc.contributor.authorTognelli, E.-
dc.contributor.authorGuarcello, M. G.-
dc.contributor.authorVink, Jorick S.-
dc.contributor.authorKlutsch, A.-
dc.contributor.authorJiménez Esteban, F. M.-
dc.contributor.authorRoccatagliata, V.-
dc.contributor.authorTautvaisilenè, G.-
dc.contributor.authorGilmore, G.-
dc.contributor.authorRandich, S.-
dc.contributor.authorAlfaro, Emilio J.-
dc.contributor.authorFlaccomio, E.-
dc.contributor.authorKoposov, S.-
dc.contributor.authorLanzafame, A. C.-
dc.contributor.authorPancino, E.-
dc.contributor.authorBergemann, M.-
dc.contributor.authorCarraro, G.-
dc.contributor.authorFranciosini, E.-
dc.contributor.authorFrasca, A.-
dc.contributor.authorGonneau, A.-
dc.contributor.authorHourihane, A.-
dc.contributor.authorJofre, P.-
dc.contributor.authorLewis, J.-
dc.contributor.authorMagrini, L.-
dc.contributor.authorMonaco, L.-
dc.contributor.authorMorbidelli, L.-
dc.contributor.authorSacco, G. G.-
dc.contributor.authorWorley, Charlotte C.-
dc.contributor.authorZaggia, S.-
dc.contributor.otherUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737-
dc.date.accessioned2021-04-14T12:59:55Z-
dc.date.available2021-04-14T12:59:55Z-
dc.date.issued2019-03-26-
dc.identifier.citationAstronomy and Astrophysics 623: A159(2019)es
dc.identifier.issn0004-6361-
dc.identifier.otherhttps://www.aanda.org/articles/aa/full_html/2019/03/aa34870-18/aa34870-18.html-
dc.identifier.urihttp://hdl.handle.net/20.500.12666/379-
dc.descriptionFull Tables A.1 and A.2 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/623/A159. Based on observations made with the ESO/VLT, at Paranal Observatory, under programme 188.B-3002 (The Gaia-ESO Public Spectroscopic Survey).es
dc.description.abstractContext. In very young clusters, stellar age distribution is empirical proof of the duration of star cluster formation and thus it gives indications of the physical mechanisms involved in the star formation process. Determining the amount of interstellar extinction and the correct reddening law are crucial steps to derive fundamental stellar parameters and in particular accurate ages from the Hertzsprung-Russell diagram. Aims. In this context, we seek to derive accurate stellar ages for NGC 6530, the young cluster associated with the Lagoon Nebula to infer the star formation history of this region. Methods. We used the Gaia-ESO survey observations of the Lagoon Nebula, together with photometric literature data and Gaia DR2 kinematics, to derive cluster membership and fundamental stellar parameters. Using spectroscopic effective temperatures, we analysed the reddening properties of all objects and derived accurate stellar ages for cluster members. Results. We identified 652 confirmed and 9 probable members. The reddening inferred for members and non-members allows us to distinguish foreground objects, mainly main-sequence stars, and background objects, mainly giants, and to trace the three-dimensional structure of the nebula. This classification is in agreement with the distances inferred from Gaia DR2 parallaxes for these objects. Finally, we derive stellar ages for 382 confirmed cluster members for which we obtained the individual reddening values. In addition, we find that the gravity-sensitive γ index distribution for the M-type stars is correlated with stellar age. Conclusions. For all members with Teff <  5500 K, the mean logarithmic age is 5.84 (units of years) with a dispersion of 0.36 dex. The age distribution of stars with accretion or discs, i.e. classical T Tauri stars with excess (CTTSe), is similar to that of stars without accretion and without discs, i.e. weak T Tauri stars with photospheric emission (WTTSp). We interpret this dispersion as evidence of a real age spread since the total uncertainties on age determinations, derived from Monte Carlo simulations, are significantly smaller than the observed spread. This conclusion is supported by evidence of the decrease of the gravity-sensitive γ index as a function of stellar ages. The presence of a small age spread is also supported by the spatial distribution and kinematics of old and young members. In particular, members with accretion or discs, formed in the last 1 Myr, show evidence of subclustering around the cluster centre, in the Hourglass Nebula and in the M8-E region, suggesting a possible triggering of star formation events by the O-type star ionization fronts.es
dc.description.sponsorshipWe wish to thank the anonymous referee for the helpful suggestions. This research has made use of data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under Programme ID 188.B-3002. These data products have been processed by the Cambridge Astronomy Survey Unit (CASU) at the Institute of Astronomy, University of Cambridge, and by the FLAMES/UVES reduction team at INAF/Osservatorio Astrofisico di Arcetri. These data have been obtained from the Gaia-ESO Survey Data Archive, prepared and hosted by the Wide Field Astronomy Unit, Institute for Astronomy, University of Edinburgh, which is funded by the UK Science and Technology Facilities Council. The authors acknowledge support through the PRIN INAF 2014 funding scheme of the National Institute for Astrophysics (INAF) of the Italian Ministry of Education, University and Research (“The Gaia-ESO Survey”, P.I.: S. Randich). This work was partly supported by the European Union FP7 programme through ERC grant number 320360 and by the Leverhulme Trust through grant RPG-2012-541. We acknowledge the support from INAF and Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR) in the form of the grant “Premiale VLT 2012”. E.T. acknowledges University of Pisa (“Modelli di stelle di massa piccola-intermedia per la determinazione dell’età degli ammassi stellari osservati dal satellite Gaia” PI: S. Degl’Innocenti, 2018) and INFN (“Iniziativa specifica TAsP”). The results presented here benefit from discussions held during the Gaia-ESO workshops and conferences supported by the ESF (European Science Foundation) through the GREAT Research Network Programme. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The VPHAS+ mosaics were generated using the MONTAGE software maintained by NASA/IPAC. The authors acknowledge modest financial contribution from the agreement ASI-INAF n.2017-14.H.O.; With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737).es
dc.language.isoenges
dc.publisherEDP Scienceses
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationales
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/-
dc.subjectAccretiones
dc.subjectAccretion diskses
dc.subjectTechniques: spectroscopices
dc.subjectStars: formationes
dc.subjectHertzsprung-Russell and C-M diagramses
dc.subjectStars: pre-main sequencees
dc.subjectOpen clusters and associations: individual: NGC 6530es
dc.titleThe Gaia-ESO Survey: Age spread in the star forming region NGC 6530 from the HR diagram and gravity indicatorses
dc.typeinfo:eu-repo/semantics/articlees
dc.identifier.doi10.1051/0004-6361/201834870-
dc.identifier.e-issn1432-0746-
dc.contributor.funderEuropean Commission (EC)-
dc.contributor.funderLeverhulme Trust-
dc.contributor.funderIstituto Nazionale di Astrofisica (INAF)-
dc.contributor.funderMinistero dell'Istruzione, dell'Università e della Ricerca (MIUR)-
dc.description.peerreviewedPeer reviewes
dc.identifier.funderhttp://dx.doi.org/10.13039/501100000275-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100005184-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100000780-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100003407-
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
dc.type.coarhttp://purl.org/coar/resource_type/c_6501-
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/320360-
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