Open cluster kinematics with Gaia DR2
| hal.structure.identifier | M2A 2018 | |
| dc.contributor.author | SOUBIRAN, C. | |
| dc.contributor.author | CANTAT-GAUDIN, T. | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Marseille [LAM] | |
| dc.contributor.author | ROMERO-GOMEZ, M. | |
| hal.structure.identifier | M2A 2018 | |
| dc.contributor.author | CASAMIQUELA, L. | |
| dc.contributor.author | JORDI, C. | |
| dc.contributor.author | VALLENARI, A. | |
| dc.contributor.author | ANTOJA, T. | |
| hal.structure.identifier | Universitat de Barcelona [UB] | |
| dc.contributor.author | BALAGUER-NUNEZ, L. | |
| dc.contributor.author | BOSSINI, D. | |
| dc.contributor.author | BRAGAGLIA, A. | |
| dc.contributor.author | CARRERA, R. | |
| dc.contributor.author | CASTRO-GINARD, A. | |
| hal.structure.identifier | Institut de recherches sur la catalyse et l'environnement de Lyon [IRCELYON] | |
| dc.contributor.author | FIGUERAS, F. | |
| hal.structure.identifier | Uppsala University | |
| dc.contributor.author | HEITER, U. | |
| hal.structure.identifier | Galaxies, Etoiles, Physique, Instrumentation [GEPI] | |
| dc.contributor.author | KATZ, D. | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| dc.contributor.author | KRONE-MARTINS, A. | |
| hal.structure.identifier | M2A 2018 | |
| dc.contributor.author | LE CAMPION, J.-F. | |
| hal.structure.identifier | SIM/IDL Faculdade de Ciências da Universidade de Lisboa [FCUL] | |
| dc.contributor.author | MOITINHO, A. | |
| dc.contributor.author | SORDO, R. | |
| dc.date.issued | 2018-11 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Context. Open clusters are very good tracers of the evolution of the Galactic disc. Thanks to Gaia, their kinematics can be investigated with an unprecedented precision and accuracy.Aims. The distribution of open clusters in the 6D phase space is revisited with Gaia DR2.Methods. The weighted mean radial velocity of open clusters was determined, using the most probable members available from a previous astrometric investigation that also provided mean parallaxes and proper motions. Those parameters, all derived from Gaia DR2 only, were combined to provide the 6D phase-space information of 861 clusters. The velocity distribution of nearby clusters was investigated, as well as the spatial and velocity distributions of the whole sample as a function of age. A high-quality subsample was used to investigate some possible pairs and groups of clusters sharing the same Galactic position and velocity.Results. For the high-quality sample of 406 clusters, the median uncertainty of the weighted mean radial velocity is 0.5 km s−1. The accuracy, assessed by comparison to ground-based high-resolution spectroscopy, is better than 1 km s−1. Open clusters nicely follow the velocity distribution of field stars in the close solar neighbourhood as previously revealed by Gaia DR2. As expected, the vertical distribution of young clusters is very flat, but the novelty is the high precision to which this can be seen. The dispersion of vertical velocities of young clusters is at the level of 5 km s−1. Clusters older than 1 Gyr span distances to the Galactic plane of up to 1 kpc with a vertical velocity dispersion of 14 km s−1, typical of the thin disc. Five pairs of clusters and one group with five members might be physically related. Other binary candidates that have been identified previously are found to be chance alignments. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics - Solar and Stellar Astrophysics | |
| dc.subject.en | Astrophysics - Astrophysics of Galaxies | |
| dc.subject.en | stars: kinematics and dynamics | |
| dc.subject.en | Galaxy: kinematics and dynamics | |
| dc.subject.en | open clusters and associations: general | |
| dc.title.en | Open cluster kinematics with Gaia DR2 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201834020 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1808.01613 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A155 | |
| bordeaux.volume | 619 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01867512 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01867512v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2018-11&rft.volume=619&rft.spage=A155&rft.epage=A155&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=SOUBIRAN,%20C.&CANTAT-GAUDIN,%20T.&ROMERO-GOMEZ,%20M.&CASAMIQUELA,%20L.&JORDI,%20C.&rft.genre=article |
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