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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28161
Title: Open cluster kinematics with Gaia DR2
Authors: Soubiran, C.
Cantat-Gaudin, T.
Romero-Gómez, M.
Casamiquela, L.
Jordi, C.
VALLENARI, Antonella 
Antoja, T.
Balaguer-Núñez, L.
Bossini, D.
BRAGAGLIA, Angela 
CARRERA, JIMENEZ RICARDO JESUS 
Castro-Ginard, A.
Figueras, F.
Heiter, U.
Katz, D.
Krone-Martins, A.
Le Campion, J. -F.
Moitinho, A.
SORDO, ROSANNA 
Issue Date: 2018
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 619
First Page: A155
Abstract: 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. <BR /> Aims: The distribution of open clusters in the 6D phase space is revisited with Gaia DR2. <BR /> 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. <BR /> Results: For the high-quality sample of 406 clusters, the median uncertainty of the weighted mean radial velocity is 0.5 km s<SUP>-1</SUP>. The accuracy, assessed by comparison to ground-based high-resolution spectroscopy, is better than 1 km s<SUP>-1</SUP>. 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<SUP>-1</SUP>. 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<SUP>-1</SUP>, 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. <P />The table with cluster velocities is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/619/A155">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/619/A155
URI: http://hdl.handle.net/20.500.12386/28161
URL: https://arxiv.org/pdf/1808.01613.pdf
https://www.aanda.org/articles/aa/abs/2018/11/aa34020-18/aa34020-18.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201834020
Bibcode ADS: 2018A&A...619A.155S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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