J/MNRAS/486/2477ivo://CDS.VizieR/J/MNRAS/486/2477doi:10.26093/cds/vizier.74862477CDSWright N.J.Jeffries R.D.Jackson R.J.Bayo A.Bonito R.Damiani F.,Kalari V.Lanzafame A.C.Pancino E.Parker R.J.Prisinzano L.,Randich S.Vink J.S.Alfaro E.J.Bergemann M.Franciosini E.,Gilmore G.Gonneau A.Hourihane A.Jofre P.Koposov S.E.Lewis J.,Magrini L.Micela G.Morbidelli L.Sacco G.G.Worley C.C.Zaggia S.2024-06-20T06:34:18Z2019-08-19T09:13:10ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fropen-star-clustersstellar-populationsphotometryeffective-temperatureradial-velocitystellar-massesThe combination of precise radial velocities from multi-object spectroscopy and highly accurate proper motions from Gaia DR2 opens up the possibility for detailed 3D kinematic studies of young star-forming regions and clusters. Here, we perform such an analysis by combining Gaia-ESO Survey spectroscopy with Gaia astrometry for ~900 members of the Lagoon Nebula cluster, NGC 6530. We measure the 3D velocity dispersion of the region to be 5.35^+0.39^_-0.34_km/s, which is large enough to suggest the region is gravitationally unbound. The velocity ellipsoid is anisotropic, implying that the region is not sufficiently dynamically evolved to achieve isotropy, though the central part of NGC 6530 does exhibit velocity isotropy that suggests sufficient mixing has occurred in this denser part. We find strong evidence that the stellar population is expanding, though this is preferentially occurring in the declination direction and there is very little evidence for expansion in the right ascension direction. This argues against a simple radial expansion pattern, as predicted by models of residual gas expulsion. We discuss these findings in the context of cluster formation, evolution, and disruption theories.2019MNRAS.486.2477Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/486/2477CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+AS/123/63 : NGC 6530 multiwavelength photometry (van den Ancker+ 1997)J/AJ/120/333 : UBVRI and H{alpha} in NGC 6530 (Sung+, 2000)J/A+A/395/499 : XMM observations in M8 and NGC6530 (Rauw+, 2002)J/ApJ/608/781 : NGC 6530 Chandra X-ray catalog (Damiani+, 2004)J/A+A/430/941 : Star formation region NGC 6530 (Prisinzano+, 2005)J/AJ/134/1368 : Proper motions in NGC 2244 and NGC 6530 (Chen+, 2007)J/A+A/462/123 : VLT/Flames spectroscopic data of NGC 6530 (Prisinzano+, 2007)J/A+A/546/A9 : Spectral classification of NGC 6530 stars (Prisinzano+, 2012)J/ApJ/747/51 : Lagoon Nebula stars. I. Rotation periods (Henderson+, 2012)J/A+A/566/A50 : Classification of stellar spectra 644-681nm (Damiani+, 2014)J/A+A/580/A75 : Velocity precision in the Gaia-ESO Survey (Jackson+, 2015)J/A+A/623/A25 : Photometric and astrometric study of NGC 6530 (Damiani+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/486/2477https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/486/2477http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/486/2477https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/486/2477https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/486/2477http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/486/2477GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/486/2477/table (Photometric and spectroscopic measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/486/2477/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/486/2477/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/486/2477/table?GETtext/xml+votable180.050000true270.6515-24.198390.0055555555555555566/28890-288911.1166583743361574e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/486/2477?format=asciidefaultJ/MNRAS/486/2477/tablePhotometric and spectroscopic measurementsGESGaia-ESO Survey source namemeta.id;meta.mainchare_Gamma? Error on Gamma (3)stat.errorfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainGaia? Gaia DR2 source name (Cat. I/345)meta.idnullableBmag? B band magnitude (1)magphot.mag;em.opt.Bfloatnullablee_Bmag? B band error (1)magstat.error;phot.magfloatnullableVmag? V band magnitude (1)magphot.mag;em.opt.Vfloatnullablee_Vmag? V band error (1)magstat.error;phot.magfloatnullableImag? I band magnitude (1)magphot.mag;em.opt.Ifloatnullablee_Imag? I band error (1)magstat.error;phot.magfloatnullableGmag? G band magnitude from Gaia DR2magphot.mag;em.optfloatnullablee_Gmag? G band error from Gaia DR2magstat.error;phot.magfloatnullableJmag? J band magnitude from 2MASSmagphot.mag;em.IR.Jfloatnullablee_Jmag? J band error from 2MASSmagstat.error;phot.magfloatnullableHmag? H band magnitude from 2MASSmagphot.mag;em.IR.Hfloatnullablee_Hmag? H band error from 2MASSmagstat.error;phot.magfloatnullableKmag? K band magnitude from 2MASSmagphot.mag;em.IR.Kfloatnullablee_Kmag? K band error from 2MASSmagstat.error;phot.magfloatnullable2Mflg2MASS quality flag for J/H/K magnitudesmeta.code.qualcharTeff? Spectroscopic Teff from GESKpos.parallax.spectintnullableRV? Spectroscopic radial velocity from GESkm/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error on RV (2)km/sstat.errorfloatnullableGamma? GES gamma index (3)spect.indexfloatnullableEWLi? GES Lithium 6708A equivalent widthmAspect.line.eqWidthfloatnullablee_EWLi? Error on EWLimAstat.errorfloatnullableFWZIHa? GES full width at zero intensity for H-alphaAspect.line.widthfloatnullablee_FWZIHa? Error on FWZIHaAstat.errorfloatnullablePlx? Gaia DR2 parallaxmaspos.parallaxfloatnullablee_Plx? Error on Plxmasstat.error;pos.parallaxfloatnullablepmRA*? Gaia DR2 proper motion in Right Ascension, pmRA*cosDEmaspos.pm;pos.eq.radoublenullablee_pmRA*? Error on pmrAmasstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion in Declinationmaspos.pm;pos.eq.decdoublenullablee_pmDE? Error on pmDEmasstat.error;pos.pm;pos.eq.decfloatnullableMassStellar mass (4)solMassphys.massfloatE_MassUpper 1 sigma uncertainty on Mass (4)solMassstat.error;stat.maxfloate_MassLower 1 sigma uncertainty on Mass (4)solMassstat.error;phys.massfloat