The VVV Open Cluster Project II. Near-infrared sequences of 37 open clusters on eight-dimensional parameter space
arXiv:2205.02735 · doi:10.1093/mnras/stac1296
Abstract
Open clusters are key coeval structures that help us understand star formation, stellar evolution and trace the physical properties of our Galaxy. In the past years, the isolation of open clusters from the field has been heavily alleviated by the access to accurate large-scale stellar parallaxes and proper motions along a determined line of sight. Still, there are limitations regarding their completeness since large-scale studies rely on optical wavelengths. Here we extend the open clusters sequences towards fainter magnitudes complementing the Gaia photometric and astrometric information with near-infrared data from the VVV survey. We performed a homogeneous analysis on 37 open clusters implementing two coarse-to-fine characterization methods: extreme deconvolution Gaussian mixture models coupled with an unsupervised machine learning method on 8-dimensional parameter space. The process allowed us to separate the clusters from the field at near-infrared wavelengths. We report an increase of 47\% new member candidates on average in our sample (considering only sources with high membership probability p0.9). This study is the second in a series intended to reveal open cluster near-infrared sequences homogeneously.
16 pages. 5 figures. MNRAS accepted. v2: language edits and references updated at the proof stage; arXiv admin note: text overlap with arXiv:2102.04303
References in corpus (15)
- Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
- Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
- Gaia EDR3 view on Galactic globular clusters
- VIRAC: The VVV Infrared Astrometric Catalogue
- The VISTA ZYJHKs Photometric System: Calibration from 2MASS
- Hunting for open clusters in \textit{Gaia} DR2: the Galactic anticentre
- Lupus DANCe. Census of stars and 6D structure with Gaia-DR2 data
- Detection of Ks-excess stars in the 14Myr open cluster NGC4755
- Ruprecht 147 DANCe I. Members, empirical isochrone, luminosity and mass distributions
- The Gaia-ESO Survey: Membership probabilities for stars in 32 open clusters from 3D kinematics
- Decoding the Morphological Evolution of Open Clusters
- Young Stellar Clusters Containing Massive Young Stellar Objects in the VVV Survey
- The VVV Open Cluster Project. Near-infrared sequences of NGC6067, NGC6259, NGC4815, Pismis18, Trumpler23, and Trumpler20
- Small scale star formation as revealed by VVVX galactic cluster candidates
- Clustered star formation towards Berkeley 87 / ON2. I. Multi-wavelength census and the population overlap problem