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HST FGS astrometry – the value of fractional millisecond of arc precision

Published online by Cambridge University Press:  01 October 2007

G. F. Benedict ,
B. E. McArthur  and
J. L. Bean
G. F. Benedict
Affiliation:
McDonald Observatory, University of Texas, Austin, TXUSA78712 email: [email protected] or [email protected]
B. E. McArthur
Affiliation:
McDonald Observatory, University of Texas, Austin, TXUSA78712 email: [email protected] or [email protected]
J. L. Bean
Affiliation:
Institute für Astrophysic, Georg-August-Universität, Göttingen, Germany email: [email protected]
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Abstract

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In a few years astrometry with the venerable combination of Hubble Space Telescope and Fine Guidance Sensor will be replaced by SIM, Gaia, and long-baseline interferometry. Until then we remain a resource of choice for sub-millisecond of arc precision optical astrometry. As examples we discuss 1) the uses which can be made of our parallaxes of Galactic Cepheids, and 2) the determination of perturbation orbital elements for several exoplanet host stars, yielding true companion masses.

Keywords

astrometryCepheidsdistance scaleplanetary systemsstars: low-massbrown dwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 23 - 29
Copyright
Copyright © International Astronomical Union 2008

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