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J/A+A/464/377       HIP binaries with radial velocities      (Frankowski+, 2007)

Proper-motion binaries in the Hipparcos Catalogue Comparison with radial velocity data. Frankowski A., Jancart S., Jorissen A. <Astron. Astrophys. 464, 377 (2007)> =2007A&A...464..377F
ADC_Keywords: Stars, double and multiple ; Proper motions ; Radial velocities Keywords: astrometry - binaries, general - catalogs - binaries: spectroscopic - binaries: visual Abstract: 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. A list of candidate proper motion binaries is constructed from a chi-square test evaluating the statistical significance of the difference between the Tycho-2 and Hipparcos proper motions for 103134 stars in common between the two catalogues (excluding components of visual systems). 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 (SB9) 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. Proper motion binaries are efficiently detected for systems with parallaxes in excess of 20mas, and periods in the range 1000-30000d. The shortest periods in this range (1000-2000d, 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 SB9 systems having periods shorter than about 400d 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 5mas, 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 84 3565 Stars flagged as proper-motion binaries
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) V/122 : SB9: 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004) V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Nordstrom+, 2004) J/A+A/430/165 : Radial velocities for 6691 K and M giants (Famaey+, 2005) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP Hipparcos (Cat. I/239) catalogue number 8- 15 F8.2 --- chi2 chi2 characterizing the difference between Hipparcos and Tycho-2 proper motions (see Eq.1) 19- 25 F7.5 --- Pr(chi2) Left-side cumulative chi2 probability (from 0 to chi2) 29 A1 --- DMSA [579VX] Code from the Hipparcos double and multiple system annex (1) 33 A1 --- SB9 [O-] O: orbit available in SB9, V/122 37 A1 --- GCC [Bbc-] Flag characterizing the variability of radial velocity in the Geneva-Copenhagen Catalogue, Cat. V/117 (2) 41 A1 --- K-M [BObc-] Flag characterizing the variability of radial velocity in the Famaey et al. (2005, J/A+A/430/165) catalogue (K & M giants) (2) 45- 84 A40 --- Rem Various remarks (3)
Note (1): HIP double and multiple system code as follows: 5 = 5 parameters (single-star) solution 7 = 7 parameters (acceleration) solution 9 = 9 parameters (acceleration) solution X = stochastic solution Note (2): Variability of radial velocity flag as follows: c = constant radial-velocity at the level Prob(chi2(Vr))>0.01 b = suspected spectroscopic binary at the level 0.001<Prob(chi2(Vr))≤0.01 B = spectroscopic binary: Prob (chi2(Vr))≤0.001 O = spectroscopic orbit available Note (3): used abbreviations: Ba = barium star sB-lm? = suspected binary with low-mass companion triple = triple system triple? = candidate triple system perspective acc. = spurious proper-motion binary due to perspective acceleration
Acknowledgements: Alain Jorissen, ajorisse(at)astro.ulb.ac.be
(End) Patricia Vannier [CDS] 15-Dec-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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