A Proper-Motion Study of Two Fields, in the Globular Cluster 47 Tucanae

Details A Proper-Motion Study of Two Fields, in the Globular Cluster 47 Tucanae A Proper-Motion Study of Two Fields, in the Globular Cluster 47 Tucanae

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8160k&link_type=abstract

HST Proposal ID #8160

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #8160 Stellar Populations In Clusters

Scientific paper

We propose, using only 5 orbits of HST time, to carry out high-precision astrometry in two fields in the globular cluster 47 Tucanae in order to {1} measure the relative proper motions in the radial and tangential directions, for many thousands of main-sequence stars and white dwarfs, and determine the anisotropy of stellar motions as a function of stellar mass; {2} strengthen our current determination of the distance of the cluster, which depends on comparing proper motions with radial velocities; {3} extend the luminosity function of the cluster 3-4 magnitudes fainter, reaching well below 0.1>m_odot; {4} measure the rotation of the cluster in the plane of the sky; {5} measure the absolute proper motion of the cluster; and {6} possibly measure the proper motion of the Small Magellanic Cloud.

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