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Suggestion to Revise the Hipparcos-Parallax of Cepheids Belonging to Binary Systems

Published online by Cambridge University Press:  14 August 2015

L. Szabados
L. Szabados*
Affiliation:
Konkoly Observatory, P.O. Box 67, H-1525, Budapest XII, Hungary

Extract

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It has been suspected (Szabados 1997) that the apparent orbit of previously unresolved binaries involving a Cepheid component falsifies the Hipparcos-parallaxes deduced for these Cepheids. Since the incidence of binaries among Cepheids exceeds 50 per cent, this adverse effect on the parallax determination is a major error source.

An obvious remedy is to repeat the determination of the five astrometric parameters for the Cepheids, members in binary systems, taking into accountthe orbital elements known from spectroscopic studies. This will result in more precise parallaxes and cosmic distance scale. Moreover, these Cepheidsare ideal targets for the future microarcsec astrometric missions.

This study was partly supported by OTKA-grants T 014852 and T 022946.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 580
Copyright
Copyright © Kluwer 1998

References

Szabados, L., 1997, in Proc. Conf. Hipparcos Venice’97; ESA SP-402, p. 631 Google Scholar