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The Dispersed Population of Dusty Young Stellar Objects in the Orion OB1 Association

The Dispersed Population of Dusty Young Stellar Objects in the Orion OB1 Association .

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The Dispersed Population of Dusty Young Stellar Objects in the Orion OB1 Association

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  1. The Dispersed Population of Dusty Young Stellar Objects in the Orion OB1 Association Following the exhaustion of the cryogenic fluids, a `warm’ mission survey extended the of the off-cloud region in the Orion/OB1 association complex. These data supplement the existing surveys of the σOrionis cluster and OB1b fields. Assemble a photometric catalogue of the extended region using Spitzer augmented with available 2MASS and WISE data. • Using only the three 2MASS bands and two IRAC bands at 3.6μm and 4.5μm, we estimate a recovered fraction of between 90 − 70%, when compared to the 3 + 4 band detections. • Using disc fractions measured by Hernandez et al. 2007, one can estimate a total off-cloud population, excluding the σOrioniscluster, 3000 − 8500 young stars. B. Mazur1, T. Megeath1, R. Gutermuth2, C. Briceno3, J. Hernandez3, J. Stauffer4 1: U. of Toledo; 2: U. of Mass; 3: CIDA, Venezuela; 4: Spitzer Science Center

  2. 110 sigma Ori 700 OB1b Recovered fractions: ~90% in σOri ~70% in OB1b Disc fractions from Hernandez (2007a,b): OB1b: ~13% σOri: ~ 35% Estimated Population (excluding σOri): 3500 - 8000

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