[L2013] J154650.23-251355.9 , the SIMBAD biblio

2013MNRAS.431.3222L - Mon. Not. R. Astron. Soc., 431, 3222-3235 (2013/June-1)

Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey - IV. Upper Sco.


Abstract (from CDS):

We present the results of a proper motion wide-field near-infrared survey of the entire Upper Sco (USco) association (∼160 square degrees) released as part of the United Kingdom Infrared Telescope Infrared Deep Sky (UKIDSS) Galactic Clusters Survey (GCS) Data Release 10 (DR10). We have identified a sample of ∼400 astrometric and photometric member candidates combining proper motions and photometry in five near-infrared passbands and another 286 with HK photometry and 2MASS/GCS proper motions. We also provide revised membership for all previously published USco low-mass stars and substellar members based on our selection and identify new candidates, including in regions affected by extinction. We find negligible variability between the two K-band epochs, below the 0.06 mag rms level. We estimate an upper limit of 2.2 per cent for wide common proper motions with projected physical separations less than ∼15 000 au. We derive a disc frequency for USco low-mass stars and brown dwarfs between 26 and 37 per cent, in agreement with estimates in IC 348 and σ Ori. We derive the mass function of the association and find it consistent with the (system) mass function of the solar neighbourhood and other clusters surveyed by the GCS in the 0.2-0.03 M☉ mass range. We confirm the possible excess of brown dwarfs in USco.

Abstract Copyright: © 2013 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): methods: observational - techniques: photometric - brown dwarfs - stars: low-mass - stars: luminosity function, mass function - open clusters and associations: individual: Upper Sco

VizieR on-line data: <Available at CDS (J/MNRAS/431/3222): tablea1.dat tableb1.dat tablec1.dat tabled1.dat tablee1.dat table3.dat>

Nomenclature: Tables 3, A1-E1: [L2013] JHHMMSS.ss+DDMMSS.s N=4+201+120+81+286+660.

Simbad objects: 320

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