Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917218c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #172.18; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We report our HST determination of proper motions in the Galactic Bulge and foreground disk populations. At over 890 ks integration time in F814W, the SWEEPS transiting exoplanet search of Sahu et al. (2006) has produced the deepest image ever taken of the galactic field, allowing stellar positions to be constrained to high accuracy at unprecedented depth. With a second epoch two years later with HST/ACS with full overlap, and a third seven years earlier with WFPC2 at 60% overlap, we are able to measure the proper-motions of diskand bulge-objects, with the aim of providing better kinematic population diagnostics than has previously been possible. We discuss the techniques used to robustly measure proper-motions from our datasets, meeting the challenges of (i) high crowding, (ii) high intrinsic velocity dispersion about a small centroid offset (unlike globular cluster studies), and (iii) significant relative distortion between the ACS-WFC and WFPC2 instruments.
Casertano Sefano
Clarkson Will
Sahu Kailash
Smith Edward
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