Reference : Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/144952
Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data
English
Frankowski, A. [Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium]
Jancart, Sylvie mailto [Université Libre de Bruxelles - ULB > Physique > IAA > >]
Jorissen, A. [Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium)]
1-Mar-2007
Astronomy and Astrophysics
EDP Sciences
464
377-392
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] astrometry ; binaries: general ; catalogs ; binaries: spectroscopic ; binaries: visual
[en] Context: This paper is the last in a series devoted to the analysis of the binary content of the Hipparcos Catalogue. <BR />Aims: The comparison of the proper motions constructed from positions spanning a short (Hipparcos) or long time (Tycho-2) makes it possible to uncover binaries with periods of the order of or somewhat larger than the short time span (in this case, the 3 yr duration of the Hipparcos mission), since the unrecognised orbital motion will then add to the proper motion. <BR />Methods: A list of candidate proper motion binaries is constructed from a carefully designed χ[SUP]2[/SUP] test evaluating the statistical significance of the difference between the Tycho-2 and Hipparcos proper motions for 103 134 stars in common between the two catalogues (excluding components of visual systems). Since similar lists of proper-motion binaries have already been constructed, the present paper focuses on the evaluation of the detection efficiency of proper-motion binaries, using different kinds of control data (mostly radial velocities). The detection rate for entries from the Ninth Catalogue of Spectroscopic Binary Orbits (S_B^9) is evaluated, as well as for stars like barium stars, which are known to be all binaries, and finally for spectroscopic binaries identified from radial velocity data in the Geneva-Copenhagen survey of F and G dwarfs in the solar neighbourhood. <BR />Results: Proper motion binaries are efficiently detected for systems with parallaxes in excess of ~20 mas, and periods in the range 1000-30 000 d. The shortest periods in this range (1000-2000 d, i.e., once to twice the duration of the Hipparcos mission) may appear only as DMSA/G binaries (accelerated proper motion in the Hipparcos Double and Multiple System Annex). Proper motion binaries detected among S_B[SUP]9[/SUP] systems having periods shorter than about 400 d hint at triple systems, the proper-motion binary involving a component with a longer orbital period. A list of 19 candidate triple systems is provided. Binaries suspected of having low-mass (brown-dwarf-like) companions are listed as well. Among the 37 barium stars with parallaxes larger than 5 mas, only 7 exhibit no evidence for duplicity whatsoever (be it spectroscopic or astrometric). Finally, the fraction of proper-motion binaries shows no significant variation among the various (regular) spectral classes, when due account is taken for the detection biases. Full Table [see full text] is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/464/377
http://hdl.handle.net/2268/144952
10.1051/0004-6361:20065526
http://adsabs.harvard.edu/abs/2007A%26A...464..377F
http://de.arxiv.org/abs/astro-ph/0612449

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
aa5526-06.pdfPublisher postprint469.47 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.