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Binaries in the Hipparcos data: Keep digging, I. Search for binaries without `a priori' knowledge of their orbital elements: Application to barium stars
Jorissen, A.; Jancart, Sylvie; Pourbaix, D.
2004In Hensberge, H; Pavlovski, K.; Hilditch, R.W. (Eds.) Spectroscopically and Spatially Resolving the Components of the Close Binary Stars
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Abstract :
[en] This work makes use of Hipparcos data to test the algorithms of (i) binary detection and (ii) orbital-parameters determination, which could possibly be used in the GAIA pipeline. The first item is addressed in this paper, whereas the second one is addressed in a companion paper by Pourbaix, Jancart, & Jorissen (2004, this volume). Here we test the ability of the algorithm to detect binaries from scratch, i.e., from the astrometric data without any a priori knowledge of the orbital elements. The Hipparcos Intermediate Astrometric Data of a complete sample of 163 barium stars (supposed to be all members of binary systems from theoretical considerations) are used as a test bench. When \varpi > 5 mas and P < 4000 d, the binary detection rate is close to 100%, but it falls to 22% when considering the whole sample, because many barium stars have small parallaxes or very long periods.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jorissen, A.
Jancart, Sylvie  ;  Université de Liège - ULiège > Architecture Site Lambert Lombard > Architecture Site Lambert Lombard
Pourbaix, D.
Language :
English
Title :
Binaries in the Hipparcos data: Keep digging, I. Search for binaries without `a priori' knowledge of their orbital elements: Application to barium stars
Publication date :
01 December 2004
Event name :
ASP Conference
Event date :
2004
Audience :
International
Main work title :
Spectroscopically and Spatially Resolving the Components of the Close Binary Stars
Editor :
Hensberge, H
Pavlovski, K.
Hilditch, R.W.
Pages :
141-143
Peer reviewed :
Peer reviewed
Available on ORBi :
since 18 March 2013

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