J/AJ/128/2316       BVRIJHKs photometry in sigma Ori cluster     (Sherry+, 2004)
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	table3.dat table4.dat
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Beginning of ReadMe : J/AJ/128/2316 BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004) ================================================================================ Photometric identification of the low-mass population of Orion OB1b. I. The sigma Orionis cluster. Sherry W.H., Walter F.M., Wolk S.J. <Astron. J., 128, 2316-2330 (2004)> =2004AJ....128.2316S ================================================================================ ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, UBVRIJKLMNH Keywords: open clusters and associations: individual (sigma Orionis) - stars: formation - stars: imaging - stars: low-mass, brown dwarfs - stars: pre-main-sequence Abstract: We report an optical photometric survey of 0.89deg^2^ of the Orion OB1b association centered on sigma Ori. This region includes most of the sigma Ori cluster, the highest-density region within Orion OB1b. We have developed a statistical procedure to identify the young, low-mass, pre-main-sequence population of the association. We estimate that the cluster has 160 members in the mass range (0.2M_sun_<=M<=1.0M_sun_). The cluster has a radius of 35pc and an estimated age of 2.5+/-0.3Myr. We estimate that the total mass of the cluster is 225+/-30M_sun_. This mass is similar to the estimated mass of the  5x10^5^yr old cluster NGC 2024. NGC 2024 and sigma Ori appear to be a well-matched pair of clusters, except for the  2Myr difference in their ages. Description: In this paper we analyze data from observations made with the 0.9 and 1.5m telescopes at the Cerro Tololo Inter-American Observatory (CTIO) between 1996 and 2002 as part of a B, V, R_C_, and I_C_ survey of the belt of Orion (Orion OB1b)