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Astron. Astrophys. 356, 529-540 (2000)

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Wide binaries among high-velocity and metal-poor stars *

C. Allen, A. Poveda and M.A. Herrera

Instituto de Astronomía, UNAM, Apartado Postal 70-264, México, D.F. 04510

Received 23 June 1999 / Accepted 9 December 1999

Abstract

A catalogue of 122 wide binaries is presented. The list was compiled by searching for common proper-motion companions to the more than 1200 high-velocity and metal-poor stars of Schuster and collaborators. We study the separations for the wide binaries ([FORMULA] AU), and find that they follow Oepik's distribution all the way up to 10 000 AU. A subgroup of them, the ones with the most halo-like orbits, follow Oepik's distribution up to 20 000 AU. The galactic orbits of all systems are calculated, and galactic orbital parameters are used, along with the metallicites, to assign each one to the old thin disk, the thick disk, or the halo population.

Key words: catalogs – stars: binaries: general – stars: Population II – Galaxy: halo

Table 2 is only available in electronic form at the CDS via anonymous ftp to ftp://cdsarc.u.strasbg.fr/pub/cats/J/A+A/356/529 (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/356/529

Send offprint requests to: Christine Allen (chris@astroscu.unam.mx)

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© European Southern Observatory (ESO) 2000

Online publication: April 10, 2000
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