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- W1984165747 abstract "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 ∼5 × 105 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." @default.
- W1984165747 created "2016-06-24" @default.
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- W1984165747 date "2004-11-01" @default.
- W1984165747 modified "2023-09-23" @default.
- W1984165747 title "Photometric Identification of the Low-Mass Population of Orion OB1b. I. The σ Orionis Cluster" @default.
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- W1984165747 doi "https://doi.org/10.1086/424863" @default.
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