J/A+A/450/681 Companions to close spectroscopic binaries (Tokovinin+, 2006)
Tertiary companions to close spectroscopic binaries.
Tokovinin A., Thomas S., Sterzik M., Udry S.
<Astron. Astrophys. 450, 681 (2006)>
=2006A&A...450..681T 2006A&A...450..681T
ADC_Keywords: Binaries, spectroscopic ; Proper motions ;
Parallaxes, trigonometric ; Stars, masses
Keywords: stars: binaries: visual - stars: binaries: spectroscopic -
stars: formation
Abstract:
We have surveyed a sample of 165 solar-type spectroscopic binaries
(SB) with periods from 1 to 30 days for higher-order multiplicity.
62 targets have been observed with the NACO adaptive optics system and
13 new physical tertiary companions were detected. Another 12 new wide
companions (5 still tentative) were retrieved from the 2MASS
(II/246) sky survey. Our binaries belong to 161 stellar systems; of
these 64 are triple, 11 quadruple and 7 quintuple. After correction
for incomplete detection, the fraction of SBs with additional
companions is 63±5%. We find that this fraction is a strong function
of the SB period P, reaching 96% for P<3d and dropping to 36% for
P>12d. Period distributions of SBs with and without tertiaries are
significantly different, but their mass ratio distributions are
identical. New statistical data on the multiplicity of close SBs
indicate that their periods and mass ratios were established very
early, but periods of SBs within triples were further shortened by
angular momentum exchange with companions.
Description:
Table 2 gives the sample of 161 multiple systems containing our 165
SBs, identified by the HIP numbers of their primaries. Table 5 lists
the orbital and physical parameters of each sub-system, combining
known information with the new discoveries reported in the paper. The
systems are linked together by their common HIP identifiers and the
codes describing the hierarchy, as detailed in the article. Notes to
Table 5 are given in the free-text format, referenced by the same HIP
numbers of primary components.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 160 Object list
table5.dat 100 266 Sub-systems
notes.dat 80 178 Notes on specific systems
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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 number
8- 14 A7 -- HD/BD Alternative designation
17- 18 I2 h RAh Right Ascension J2000 (hours)
20- 21 I2 min RAm Right Ascension J2000 (minutes)
23- 24 I2 s RAs Right Ascension J2000 (seconds)
26 A1 --- DE- Declination J2000 (sign)
27- 28 I2 deg DEd Declination J2000 (degrees)
30- 31 I2 arcmin DEm Declination J2000 (minutes)
33- 34 I2 arcsec DEs Declination J2000 (seconds)
36- 40 I5 mas/yr pmRA Proper motion in right ascension
42- 46 I5 mas/yr pmDE Proper motion in declination
48- 52 F5.1 mas Plx Parallax
54- 58 F5.2 mag Vmag V-band magnitude
60- 64 F5.2 mag B-V B-V color index
66- 71 A6 --- SpType MK spectral type
74 I1 --- Ncomp Number of known components
76 I1 --- AO [0/1] 1 = adaptative optics observation
78 I1 --- 2MASS [0/1] 1 = observed by 2MASS
80 I1 --- Speckle [0/2] speckle observation (1)
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Note (1): Speckle flags as follows:
0 = not observed by speckle-interferometry
1 = observed but unresolved
2 = observed and resolved
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos number
9- 15 A7 --- Comp Components: primary,secondary,parent
17- 22 A6 --- Type Type of the system (1)
24- 30 F7.3 --- Sep Separation
32 A1 --- x_Sep ["m] Separation unit (m for mas)
34- 41 F8.3 --- Per Orbital period
43 A1 --- x_Per [dyk] Period unit (days, years, kiloyears)
45- 48 F4.2 solMass Mass1 Primary mass
50 A1 --- Mcode1 Primary mass code (2)
52- 55 F4.2 solMass Mass2 Secondary mass
57 A1 --- Mcode2 Secondary mass code (2)
59-100 A42 --- Rem Remark
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Note (1): Discovery/observing status code:
c = wide, possibly C.P.M. system
C = C.P.M. (common proper motion) system (sep.>3")
The following small letters give the criteria used:
h = hypothetical parallax
r = radial velocities
p = photometric distances
m = proper motions
v = close visual or interferometric system (sep.<3")
V = visual system with computed orbit
a = astrometric system (perturbed motion suspected)
A = astrometric orbit for invisible companion is computed
s = possibly spectroscopic system (var. RV or composite sp.)
S1, S2 = spectroscopic system with computed orbit, single- or double-lined
o = occultation binary
E = eclipsing binary with known period
e = eclipsing binary, period not known
AO = discovered with adaptive optics here
2M = discovered with 2MASS data here
Note (2): Mass codes as follows:
* = given in the original publication
a = estimated from spectral type or B-V color index from Allen tables
s = sum of masses for the sub-system(s)
q = estimated from primary mass and mass ratio of SB2
m = minimum secondary mass for SB1
v = estimated from magnitude difference of a visual binary
: = uncertain, magnitude difference assumed to be 2mag
? = uncertain component
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
8- 80 A73 --- Note Text of the note
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Acknowledgements: Andrei Tokovinin, atokovinin(at)ctio.noao.edu
Historical notes:
* 16-Oct-2006: In table2, for HIP 3362, HD/BD name corrected
* 09-Mar-2007: HIP 104858 has been removed from the tables, as
asked by the author, Andrei Tokovinin:
"The object HIP 104858 (HR 8123, HD 202275. Del Equ)
is not a spectroscopic binary with 5.7d period but a visual binary
with 5.7yr period. It must be removed from the Tables 2 and 5."
(End) Patricia Vannier [CDS] 09-Mar-2007