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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 84 3565 Stars flagged as proper-motion binaries
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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
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Bytes Format Units Label Explanations
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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)
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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
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Acknowledgements:
Alain Jorissen, ajorisse(at)astro.ulb.ac.be
(End) Patricia Vannier [CDS] 15-Dec-2006