25 Ori group low-mass stars : J/MNRAS/444/1793


Authors : Downes J.J. orcid , Briceno C., Mateu C. (hide) , Briceno C., Mateu C. et..al

Bibcode : 2014MNRAS.444.1793D (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Clusters, open; Stars, M-type; Photometry, infrared
UAT : Open star clusters, M stars, Infrared photometry

Observation (OC)

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Inserted into VizieR : 09-Sep-2015
Last modification : 10-Aug-2024

The low-mass star and sub-stellar populations of the 25 Orionis group. (2014)

Keywords : brown dwarfs - stars low-mass - open clusters and associations: individual: 25 Orionis

Abstract:We present the results of a survey of the low-mass star and brown dwarf population of the 25 Orionis group. Using optical photometry from the CIDA (Centro de Investigaciones de Astronomia Francisco J. Duarte, Merida, Venezuela) Deep Survey of Orion, near-IR photometry from the Visible and Infrared Survey Telescope for Astronomy and low-resolution spectroscopy obtained with Hectospec at the MMT telescope, we selected 1246 photometric candidates to low-mass stars and brown dwarfs with estimated masses within 0.02<~M/M_{sun}_<~0.8 and spectroscopically confirmed a sample of 77 low-mass stars as new members of the cluster with a mean age of ~7Myr. We have obtained a system initial mass function of the group that can be well described ...(more)
Abstract: (hide)
Multi-epoch optical V-, R-, I-band and H{alpha} observations across the entire Orion OB1 association (spanning ~180deg^2^) were obtained as part of the CVSO (Briceno et al., 2005AJ....129..907B, Cat. J/AJ/129/907), being conducted since 1998 with the Jurgen Stock 1.0/1.5 Schmidt-type telescope and the 8000x8000-pixel QUEST-I CCD Mosaic camera, at the National Astronomical Observatory of Venezuela. During 2009 a new dedicated 4m survey telescope, the Visible and Infrared Survey Telescope for Astronomy (VISTA), located at ESO's Paranal Observatory, was commissioned by the VISTA consortium. For the Galactic Science Verification of VISTA, an ~30deg^2^ area of the Orion OB1 association, which included the Orion Belt region, part of the Orion A cloud, the 25 Orionis and {sigma} Ori clusters, was imaged in the Z, Y, J, H and Ks filters, during 2009 October 16 to November 2.


                
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