Astrometry with Hubble Space Telescope Fine Guidance Sensors - A Review
G. Fritz Benedict, Barbara E. McArthur, Edmund P. Nelan, and Thomas E., Harrison
TL;DR
This review summarizes two decades of Hubble Space Telescope Fine Guidance Sensor astrometry, highlighting precise parallaxes, stellar mass estimates, and comparisons with Gaia, emphasizing its ongoing relevance for faint targets beyond Gaia's reach.
Contribution
It provides a comprehensive review of FGS astrometry results and discusses its potential future applications with next-generation telescopes.
Findings
Precise parallaxes for astrophysical stars
Mass estimates for stellar companions and exoplanets
Comparison with Gaia results shows complementary strengths
Abstract
Over the last 20 years Hubble Space Telescope Fine Guidance Sensor interferometric astrometry has produced precise and accurate parallaxes of astrophysical interesting stars and mass estimates for stellar companions. We review parallax results, and binary star and exoplanet mass determinations, and compare a subset of these parallaxes with preliminary Gaia results. The approach to single-field relative astrometry described herein may continue to have value for targets fainter than the Gaia limit in the coming era of 20-30m telescopes.
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