Pal 3 and Eridanus: HST CMDs of Second-Parameter Globular Clusters in the Outer Halo

Session 71 - Globular Clusters.
Display session, Wednesday, January 15
Metropolitan Ballroom,

[71.01] Pal 3 and Eridanus: HST CMDs of Second-Parameter Globular Clusters in the Outer Halo

P. B. Stetson, J. E. Hesser, R. D. McClure, S. van den Bergh (NRC/HIA/DAO), M. Bolte (Lick), W. E. Harris (McMaster U.), D. A. VandenBerg (U. Victoria), H. E. Bond (STScI), G. G. Fahlman, H. B. Richer (UBC), R. A. Bell (U. Md.)

Color-magnitude diagrams (CMDs) of Pal 3 (R_gc = 90 Kpc, [Fe/H]= -1.7) and Eridanus (R_gc = 83 Kpc, [Fe/H]= -1.5) obtained from Cycle 4 amp; 5 data in V (F555W) and I (F814W) are being reduced with ALLFRAME. A large range in the available [Fe/H] determinations for these outer halo clusters compromises efforts to select inner halo clusters appropriate for a fully differential comparison. That and other complications notwithstanding, preliminary indications are that the CMDs for these low-mass clusters may differ from those of more massive inner halo clusters.

Program listing for Wednesday