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Proceedings Paper

K giants as astrometric reference stars for the Space Interferometry Mission
Author(s): Sabine Frink; Andreas Quirrenbach; Debra Fischer; Siegfried Roeser; Elena Schilbach
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Paper Abstract

Wide angle astrometry with the Space Interferometry Mission needs a set of several thousand grid stars distributed uniformly over the sky. The requirements for candidate grid stars are quite stringent: the photocenters of these stars have to be astrometrically stable to within a few microarcseconds, which makes binary stars unacceptable as grid stars. We search the most precise and comprehensive astrometric catalogs available today--the Hipparcos, Tycho-1 and Tycho-2 Catalogues--for possible grid stars, and discuss the properties of samples of K giants derived from these catalogs. Furthermore, we present results of a precise radial velocity study of a small proxy sample of Hipparcos K giants. We demonstrate that it is possible to find K giants with radial velocity variations smaller than a few tens of meters per second on timescales of several months. It is thus possible to detect stellar companions in samples of candidate grid stars by means of a radial velocity survey. We discuss the results of Monte Carlo simulations that address the consequences of the measurement accuracy of a radial velocity survey on the portion of undetected binary systems.

Paper Details

Date Published: 5 July 2000
PDF: 9 pages
Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390282
Show Author Affiliations
Sabine Frink, Univ. of California/San Diego (United States)
Andreas Quirrenbach, Univ. of California/San Diego (United States)
Debra Fischer, Univ. of California/Berkeley (United States)
Siegfried Roeser, Astronomisches Rechen-Institut Heidelberg (Germany)
Elena Schilbach, Astrophysikalisches Institut Potsdam (Germany)

Published in SPIE Proceedings Vol. 4006:
Interferometry in Optical Astronomy
Pierre J. Lena; Andreas Quirrenbach, Editor(s)

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