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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 710159.0, MPI für Astronomie / Publikationen_mpia
Astrometric and photometric mass functions in open clusters from UKIDSS GCS DR9
Authors:Lodieu, N.; Boudreault, S.; Deacon, N. R.; Hambly, N. C.
Place of Publication:Cham
Date of Publication (YYYY-MM-DD):2014
Audience:Not Specified
Abstract / Description:We present the results of a deep (J = 19. 1 mag) infrared (ZYJHK) survey of three open clusters surveyed by the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS) Data Release 9: the Pleiades, alpha Per, and Praesepe. We have selected cluster member candidates combining photometry in five near-infrared filters and proper motions derived from the multiple epochs provided by the UKIDSS GCS DR9. We provide revised membership for all previously published low-mass stars and brown dwarfs recovered by the GCS and complete the full census with new cluster member candidates. We find no evidence of K-band variability in all three clusters with mean dispersions of 0.06-0.09 mag, except for a few sources. We derive the cluster mass functions and find that their shapes are very similar and in agreement with the log-normal representation of the (system) field mass function although with some variations in the characteristic mass and dispersion values. Finally, we estimate the binary fraction of low-mass stars and brown dwarfs in Praesepe and the Pleiades, respectively, and compare them with the latest hydrodynamical simulations.
Free Keywords:Physics
External Publication Status:published
Document Type:Other
Communicated by:N. N.
Affiliations:MPI für Astronomie
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