Catalogue of members of NGC 6530

The 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.

Cone search capability for table J/MNRAS/486/2477/table (Photometric and spectroscopic measurements)

Identifier
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/486/2477
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/486/2477
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/486/2477
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/486/2477
Provenance
Creator Wright 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.
Publisher CDS
Publication Year 2019
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Exoplanet Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy