Trigonometric Parallax of the Globular Cluster 47 Tucanae

Details Trigonometric Parallax of the Globular Cluster 47 Tucanae Trigonometric Parallax of the Globular Cluster 47 Tucanae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9058k&link_type=abstract

HST Proposal ID #9058

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #9058 Stellar Populations

Scientific paper

Using high-precision astrometric techniques that we have developed and demonstrated, we propose to measure the trigonometric parallax of 47 Tuc, which is about 1/4 milliarcsec, to an accuracy of 10%. By repeating a field that was observed in 1995, we will measure the secular motion of the cluster stars with respect to the SMC background with sufficient accuracy that the parallax can be measured directly from the displacements within Cycle 10. Constraints of orientation, and the shape of the WFPC2 footprint, require that we take images at 3-month intervals, rotating 90 degrees each time. This project will have an important impact on the globular-cluster distance scale, and through it on the distance scale and age of the Universe. By doing so it will demonstrate the astrometric power of HST par excellence.

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