Proper motions of bulge stars

Details Proper motions of bulge stars Proper motions of bulge stars

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8250k&link_type=abstract

HST Proposal ID #8250

Physics

Hst Proposal Id #8250 Galaxy Structure And Dynamics

Scientific paper

We request second-epoch observations of two fields in the galactic bulge for proper motion measurements, using WFPC2. These observations will allow velocities to be measured with an accuracy of 70km/s, sufficient to study the rotation properties of the bulge and disk in these fields, the vertical kinematics as a function of stellar type, and the presence of kinematic substructure such as might be caused by accretion of small satellites or dissolution of globular clusters. Further, a proper motion selected color-magnitude diagram will yield the best possible depiction of the Galactic bulge turnoff point. The first epoch observations were two-band, single- dither exposures. For the second epoch we will only use one band, but use two half-pixel dithered positions to improve the position accuracy.

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