Other
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312106p&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #121.06; Bulletin of the American Astronomical Society, Vol. 31, p.664
Other
Scientific paper
The transfer of positional information from one dataset to another allows one to devise new methods of using the new generation of large ground based telescopes in conjunction with high resolution space telescopes such as HST. While the long term monitoring of variable stars with HST is usually not possible, we discuss how one can obtain a few initial space based images which can then be followed by more traditional, lower resolution, ground based observations of the same fields over a more extended, or better sampled, time period. We illustrate this point by presenting current work on the globular cluster NGC 6712. This cluster was imaged using the PC camera on board HST, and was later observed by the VLT Test Camera during the course of the Science Verification program of UT 1. We show how the precise knowledge of the source positions, derived with the help of the HST images, can provide an essential starting point if one wants to improve the photometric measurements in such crowded fields.
de Marchi Guido
Hook Richard N.
Lucy Leon B.
Pirzkal Nor
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