The seven sisters DANCe
Langue
en
Article de revue
Ce document a été publié dans
Astronomy and Astrophysics - A&A. 2018-09, vol. 617, p. A15
EDP Sciences
Résumé en anglais
Context. The photometric and astrometric measurements of the Pleiades DANCe DR2 survey provide an excellent test case for the benchmarking of statistical tools aiming at the disentanglement and characterisation of nearby ...Lire la suite >
Context. The photometric and astrometric measurements of the Pleiades DANCe DR2 survey provide an excellent test case for the benchmarking of statistical tools aiming at the disentanglement and characterisation of nearby young open cluster (NYOC) stellar populations.Aims. We aim to develop, test, and characterise of a new statistical tool (intelligent system) for the sifting and analysis of NYOC populations.Methods. Using a Bayesian formalism, with this statistical tool we were able to obtain the posterior distributions of parameters governing the cluster model. It also used hierarchical bayesian models to establish weakly informative priors, and incorporates the treatment of missing values and non-homogeneous (heteroscedastic) observational uncertainties.Results. From simulations, we estimated that this statistical tool renders kinematic (proper motion) and photometric (luminosity) distributions of the cluster population with a contamination rate of 5.8 ± 0.2%. The luminosity distributions and present day mass function agree with the ones found in a recent study, on the completeness interval of the survey. At the probability threshold of maximum accuracy, the classifier recovers ≈90% of the recently published candidate members and finds 10% of new ones.Conclusions. A new statistical tool for the analysis of NYOC is introduced, tested, and characterised. Its comprehensive modelling of the data properties allows it to get rid of the biases present in previous works. In particular, those resulting from the use of only completely observed (non-missing) data and the assumption of homoskedastic uncertainties. Also, its Bayesian framework allows it to properly propagate observational uncertainties into membership probabilities and cluster velocity and luminosity distributions. Our results are in a general agreement with those from the literature, although we provide the most up-to-date and extended list of candidate members of the Pleiades cluster.< Réduire
Mots clés en anglais
methods: data analysis
methods: statistical
proper motions
stars: luminosity function
mass function
open clusters and associations: individual: M 45
Project ANR
Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale - ANR-10-EQPX-0029
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
Evolution dynamique des amas stellaires jeunes - ANR-10-JCJC-0501
Innovative strategies for observing and modelling natural systems
Vers une comprehension de l'evolution rotationnelle des etoiles - ANR-11-BS56-0020
FUTURE
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
Evolution dynamique des amas stellaires jeunes - ANR-10-JCJC-0501
Innovative strategies for observing and modelling natural systems
Vers une comprehension de l'evolution rotationnelle des etoiles - ANR-11-BS56-0020
FUTURE
Origine
Importé de halUnités de recherche