AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 68. The Young Ones 1: Star Formation, Disks and Jets
Display, Wednesday, June 2, 1999, 10:00am-6:30pm, Southwest Exhibit Hall

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[68.14] Searching for Clustering of Low Mass Pre-main Sequence Stars in the Orion OB1b Sub-Association

W. H. Sherry, F. M. Walter (SUNY Stony Brook), S. J. Wolk (CfA)

We report on a project to map the spatial distribution of low mass pre-main sequence (PMS) stars around and between the stars of Orion's belt. We have UBVRI observations of ~3 deg2 around and between the 3 O and B stars of Orion's belt, \zeta, \epsilon, and \delta Orionis and \sigma Orionis. We have found a well defined PMS locus in the color-magnitude diagram around each star. This allows us to select likely PMS stars photometrically.

We discuss the spatial distribution of the PMS stars. We also present color-magnitude diagrams of the low mass stars in regions close to each of the O and B stars, and from selected regions between the massive stars. We will discuss the ages of PMS stars in each region.

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