Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8270s&link_type=abstract
HST Proposal ID #8270
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #8270 Galaxy Structure And Dynamics
Scientific paper
We propose to continue our investigation into the proper motion of distant satellites of the Milky Way with a series of HST snapshots around faint galaxies within our Leo II astrometric field. We will determine a proper motion for Leo II by combining images from 111 Palomar 200" photographic plates taken by Baade between 1950-1959 with the HST snapshots. Only with the fine pixel scale of HST can we realistically hope to match the exquisite Baade images, which were all taken on the very best nights from a decade of Baade's allotment of about forty 200arcsecond nights a year. As part of Siegel's Ph.D. thesis, our project on Leo II will: {1} Determine the proper motion of Leo II with respect to the extra-galactic reference frame, allowing a measurement of the orbital properties of Leo II from 3-D space velocity {1} Develop techniques {of growing importance with the declining availability of photographic cameras and plates} for the astrometric combination of WFPC2 data with older plate material to derive high-precision proper motions. {2} Determine the proper motion for an object at the greatest Galactocentric distance yet attempted, which will provide significant leverage in determining the mass of the Galaxy. {3} Provide a list of proper-motion selected stars for future refinement of the proper motion and parallax of Leo II with the Space-Interferometry Mission.
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