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A photometric and astrometric investigation of the brown dwarfs in Blanco 1


Casewell, SL and Baker, DEA and Jameson, RF and Hodgkin, ST and Dobbie, PD and Moraux, E, A photometric and astrometric investigation of the brown dwarfs in Blanco 1, Monthly Notices of the Royal Astronomical Society, 425, (4) pp. 3112-3118. ISSN 0035-8711 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The Authors

DOI: doi:10.1111/j.1365-2966.2012.21535.x


We present the results of a photometric and astrometric study of the low-mass stellar and substellar population of the young open cluster Blanco 1. We have exploited J-band data, obtained recently with the Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope (UKIRT), and 10-year-old I- and z-band optical imaging from CFH12k on the Canada–France–Hawaii Telescope (CFHT), to identify 44 candidate low-mass stellar and substellar members, in an area of 2 deg2, on the basis of their colours and proper motions. This sample includes five sources which are newly discovered. We also confirm the lowest mass candidate member of Blanco 1 unearthed so far (29MJup). We determine the cluster mass function to have a slope of α = +0.93, assuming it to have a power-law form. This is high, but nearly consistent with previous studies of the cluster (to within the errors), and also that of its much better studied Northern hemisphere analogue, the Pleiades.

Item Details

Item Type:Refereed Article
Keywords:brown dwarfs; stars: low-mass; open clusters and associations: individual: Blanco 1
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:79950
Year Published:2012
Web of Science® Times Cited:5
Deposited By:Mathematics and Physics
Deposited On:2012-10-15
Last Modified:2015-02-10

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