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Chromatic effects in Hipparcos parallaxes and implications for distance scale

Published online by Cambridge University Press:  23 May 2005

Dimitri Pourbaix
Dimitri Pourbaix
Affiliation:
Institute of Astronomy and Astrophysics, Université libre de Bruxelles CP 226, B-1050 Brussels, Belgium email: [email protected] and Department of Astrophysical Sciences, Princeton University, Princeton NJ 08543-1001, USA
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Abstract

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The change in the measured position due to the chromatic effect in the optical system is usually so small that it can be neglected. However, in the case of the Hipparcos mission, this effect is of the same magnitude as the targeted precision; it is therefore mandatory to correct for it. The different assumptions adopted to build up such corrections in the Hipparcos framework are presented. Some of their limitations and how they can be overcome to improve the results even today are described. The chromaticity mainly affects red stars and has its strongest impact on the astrometry of very red and highly variable stars such as Miras. Nevertheless, the implications on distance scale determination are rather small.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC196 , June 2004 , pp. 377 - 385
Copyright
© 2004 International Astronomical Union