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Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8738k&link_type=abstract
HST Proposal ID #8738
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Hst Proposal Id #8738 Stellar Populations
Scientific paper
The two calibration fields in Omega Cen have been observed repeatedly over the years, yet have never been exploited scientifically. These two fields are the main calibration field at 12' {5 r_c} and the ``dense'' calibration field at 4arcm6 {2 r_c}. The main calibration field, in particular, has been imaged over 900 times, through a variety of filters. We propose to combine these many independent observations to obtain exquisite photometry {0.002 mag} and proper motions {0.07 mas/yr}. Our scientific aims are threefold: {1} We will measure the anisotropy of the velocity distribution. This should be quite large for this unrelaxed cluster. We will do this as a function of mass, a dynamical distinction that has never been possible before. {2} We will compare the internal dispersions of proper motions in these fields with the central velocity dispersion {as measured in another proposal}. Both of these observations will lead to a new understanding of the dynamics of the cluster. {3} In the outer field, we will do high-precision photometry of stars along the main sequence. An earlier study {at 7'} showed the main sequence to bifurcate into two sequences separated in color by 0.05 mags {0.5 dex in Fe/H}. Having photometrically separated the stars into populations of different metallicity, we can examine the kinematics and spatial distributions as a function of metallicity.
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