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Session 91 - Structure of Molecular Clouds.
Oral session, Wednesday, January 15
We report results of a JHK imaging survey of the central square degree of the \rho Ophiuchi star-forming cloud core, the largest such survey to date. We catalog nearly 4500 sources, the vast majority being background stars. Our 90%, 10\sigma completeness limits are J=15.0, H=14.5, and K=14.0. Our derived positions for these sources are good to \sim 1.2^\prime\prime, derived from comparison with HST guide stars. We have also cross-identified our sources with all existing published near-infrared surveys, resulting in one or more identifications for 449 sources. Of these, 79 sources have four or more independent magnitude measurements at K. Using rather strict criteria (\sigma_K \ge 0.4 mag, \sigma_J,H \ge 0.2), we identify thirteen variable sources. Follow-up work on newly identified cluster members is in progress (see abstract presented by Casement, Barsony amp; Ressler elsewhere at this Meeting).
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