J/ApJ/838/54 Accurate astrometry & RVs of 4 multiple systems (Tokovinin+, 2017)
Relative orbit orientation in several resolved multiple systems.
Tokovinin A., Latham D.W.
<Astrophys. J., 838, 54-54 (2017)>
=2017ApJ...838...54T 2017ApJ...838...54T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Radial velocities ;
Binaries, spectroscopic
Keywords: binaries: general; binaries: spectroscopic; stars: solar-type
Abstract:
This work extends the still modest number of multiple stars with known
relative orbit orientation. Accurate astrometry and radial velocities
are used jointly to compute or update outer and inner orbits in three
nearby triple systems, HIP 101955 (orbital periods 38.68 and 2.51yr),
HIP 103987 (19.20 and 1.035yr), HIP 111805 (30.13 and 1.50yr), and in
one quadruple system, HIP 2643 (periods 70.3, 4.85, and 0.276yr), all
composed of solar-type stars. The masses are estimated from the
absolute magnitudes and checked using the orbits. The ratios of outer
to inner periods (from 14 to 20) and the eccentricities of the outer
orbits are moderate. These systems are dynamically stable, but not
very far from the stability limit. In three systems, all orbits are
approximately coplanar and have small eccentricity, while in HIP101955
the inner orbit with e=0.6 is highly inclined.
Description:
The outer subsystems are classical visual binaries. Historic
micrometric measurements and modern speckle interferometric data have
been obtained from the WDS database on our request. Additionally, we
secured new speckle astrometry and relative photometry of two systems
at the 4.1m SOAR telescope.
Published radial velocities (RVs) are used here together with the new
data. The RVs were measured with the CfA Digital Speedometers,
initially using the 1.5m Wyeth Reflector at the Oak Ridge Observatory
in the town of Harvard, Massachusetts, and subsequently with the 1.5m
Tillinghast Reflector at the Whipple Observatory on Mount Hopkins,
Arizona. Starting in 2009, the new fiber-fed Tillinghast Reflector
Echelle Spectrograph (TRES) was used. The spectral resolution was
44000 for all three spectrographs.
Two objects, HIP 101955 and 103987, were observed in 2015 with the
CHIRON echelle spectrograph at the 1.5m telescope at CTIO with a
spectral resolution of 80000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 4 Basic parameters of multiple systems
table3.dat 93 212 Relative positions and residuals
table4.dat 80 361 Radial velocity and residuals
table6.dat 37 5 Relative orbit orientation and period ratio
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
J/A+A/341/121 : Visual binary orbits and masses (Soederhjelm 1999)
J/AJ/121/3224 : Speckle interferometry of HIP binaries (Mason+, 2001)
J/BaltA/11/153 : HIP visual binaries kinematics. II. (Bartkevicius+, 2002)
J/A+A/385/87 : Speckle interferometry of nearby mult. stars (Balega+, 2002)
J/AJ/124/1144 : Orbits of 171 single-lined spectrosc. binaries (Latham, 2002)
J/A+A/384/1030 : Orientation of orbits in triple stars (Sterzik+, 2002)
J/A+A/382/118 : Spectroscopic sub-systems in multiple stars (Tokovinin+, 2002)
J/A+A/442/365 : Astrometric orbits of SB9 stars (Jancart+, 2005)
J/AJ/138/813 : Speckle interferometry at Mount Wilson Obs. (Hartkopf+, 2009)
J/ApJ/715/1203 : υ Andromedae system with HST (McArthur+, 2010)
J/ApJ/790/146 : Planets in Kepler's multi-transiting systems (Fabrycky+, 2014)
J/AJ/147/86 : From binaries to multiples. I. FG-67 sample (Tokovinin, 2014)
J/ApJ/799/4 : Robo-AO observations of binary stars (Riddle+, 2015)
J/AJ/149/195 : Spectrosc. of the quadruple system HD 91962 (Tokovinin+, 2015)
J/AJ/152/213 : Interferometry & spectrosc. of sigma Orionis (Schaefer+, 2016)
J/AJ/152/11 : Orbits of four triple stars (Tokovinin, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos number
8-13 I6 --- HD HD number
15-24 A10 --- WDS WDS designation (HHMMm+DDMM; J2000)
26-28 A3 --- SpT MK spectral type
30-33 F4.2 mag Vmag [6.8/8] V-band magnitude
35-38 F4.2 mag B-V [0.5/1.3] B-V color index
40-43 F4.2 mag Kmag [4.7/6.4] K-band magnitude
45-49 F5.2 mas plx [17.5/60]? HIP2 parallaxe
51-54 F4.2 mas e_plx [0.6/4]? plx uncertainty
56-59 F4.1 mas plxD [16/59] Dynamical parallaxe (πdyn)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos number (G1)
43- 47 A5 --- m_HIP System designation
49- 57 F9.4 yr Date [1885.81/2016.39] Besselian date of observation
59- 63 F5.1 deg PA [20.8/358] Position angle
65- 70 F6.4 arcsec Sep [0.008/1] Separation
72- 77 F6.4 arcsec Sigma [0.001/1.1] Measurement error
79- 83 F5.1 deg (O-C)PA [-59.7/28.3] Residual in position angle
85- 91 F7.4 arcsec (O-C)Sep [-0.09/0.09] Residual in separation
93 A1 --- Ref Data source (1)
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Note (1): Data source as follows:
G = DSSI at Gemini (23 occurrences);
H = Hiparcos (3 occurrences);
M = micrometer measures (56 occurrences);
S = speckle interferometry at SOAR (18 occurrences);
s = other speckle interferometry (112 occurrences).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos number (G1)
43- 45 A3 --- m_HIP Component designation
47- 56 F10.4 d JD [43361.5/57301.6] Julian date of observation,
JD-2400000
58- 64 F7.3 km/s RVel [-47/12.6] Radial velocity
66- 70 F5.3 km/s e_RVel [0.1/7.6] Measurement error (σRV)
72- 77 F6.3 km/s (O-C) [-5/3.6] Residual
79- 80 A2 --- Ref Data source (1)
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Note (1): Data source as follows:
C = CHIRON (7 occurrences);
D = D87; Duquennoy, A. 1987A&A...178..114D 1987A&A...178..114D (84 occurrences);
L = CfA (261 occurrences);
L- = Cfa -1km/s (8 occurrences);
T = Tokovinin & Smekhov (2002, J/A+A/382/118 ; 1 occurrence).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
8-12 F5.2 yr Pout [4.8/70.4] Outer period Pout
14-17 F4.2 --- eout [0.1/0.4] Outer eccentricity eout
19-23 F5.2 --- Po/Pi [14.4/20.1] Period ratio (Pout/Pin)
25-28 F4.2 --- e_Po/Pi [0.02/0.3] Po/Pi uncertainty
30-33 F4.1 deg Phi [2/65]? Angle φ between the
orbital angular momentum vectors
35-37 F3.1 deg e_Phi [1/9]? Phi uncertainty
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Global notes:
Note (G1): In tables 3 and 4, HIP 111895 is very likely a misprint for 111805;
identifier number corrected at CDS.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Oct-2017