SIMBAD references

2004AJ....128.2316S - Astron. J., 128, 2316-2330 (2004/November-0)

Photometric identification of the low-mass population of Orion OB1b. I. The σ Orionis cluster.


Abstract (from CDS):

We report an optical photometric survey of 0.89 deg2 of the Orion OB1b association centered on σ Ori. This region includes most of the σ 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 (0.2≤M≤1.0 M). The cluster has a radius of ∼3-5 pc and an estimated age of 2.5±0.3 Myr. We estimate that the total mass of the cluster is 225±30 M. This mass is similar to the estimated mass of the ∼5x105 yr old cluster NGC 2024. NGC 2024 and σ Ori appear to be a well-matched pair of clusters, except for the ∼2 Myr difference in their ages.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual (σ Orionis) - Stars: Formation - Stars: Imaging - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/AJ/128/2316): table3.dat table4.dat>

Nomenclature: Table 4: [SWW2004] N=234.

Simbad objects: 262

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