Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 80 160 Object list table5.dat 100 266 Sub-systems notes.dat 80 178 Notes on specific systems
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
Note (1): Speckle flags as follows: 0 = not observed by speckle-interferometry 1 = observed but unresolved 2 = observed and resolved
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP HIP number 8- 80 A73 --- Note Text of the note
Acknowledgements: Andrei Tokovinin, atokovinin(at) 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
(End) Patricia Vannier [CDS] 09-Mar-2007
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

catalogue service