J/AJ/154/110 Orbits based on SOAR speckle interferometry. II. (Tokovinin, 2017)
New orbits based on speckle interferometry at SOAR. II.
Tokovinin A.
<Astron. J., 154, 110-110 (2017)>
=2017AJ....154..110T 2017AJ....154..110T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Binaries, orbits ; Interferometry
Keywords: binaries: spectroscopic - binaries: visual
Abstract:
Orbits of 44 close and fast visual binaries are computed using the
latest speckle observations; 23 orbits are determined for the first
time, and the rest are revisions, some of those substantial. Six
combined orbits use radial velocities. The median period is 15.6
years, and the shortest period is one year. Most stars are nearby
late-type dwarfs. Dynamical parallaxes and estimates of the masses are
derived from the orbital elements and the photometry of the
components.
Description:
We present new or updated orbits of 44 binary systems or subsystems.
It is based on speckle interferometric measurements made at the 4.1m
Southern Astrophysical Research (SOAR) telescope (Tokovinin et al.
2010, Cat. J/AJ/139/743; 2014, Cat. J/AJ/147/123; 2015, Cat.
J/AJ/150/50; 2016, Cat. J/AJ/151/153; 2010PASP..122.1483T 2010PASP..122.1483T; Tokovinin
2012, Cat. J/AJ/144/56) combined with archival data collected in the
Washington Double Star Catalog (WDS; Mason et al. 2001-2014, Cat.
B/wds). It continues previous work on binary orbits resulting from the
SOAR speckle program and follows the template of the Paper I
(Tokovinin 2016, Cat. J/AJ/152/138), where the motivation is
discussed. Briefly, the calculation of binary orbits is part of the
astronomical infrastructure, and visual orbital elements are used in
many areas. The state of the art is reflected in the Sixth Catalog of
Visual Binary Orbits (VB6; Hartkopf et al. 2001AJ....122.3472H 2001AJ....122.3472H;
http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.html).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 148 44 Orbital elements
table2.dat 56 525 Observations and residuals
table3.dat 84 44 Parallaxes and photometry
notes.dat 1966 44 Notes on individual binaries
refs.dat 136 16 References
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
J/AJ/152/138 : Orbits based on SOAR speckle interferometry (Tokovinin, 2016)
J/ApJ/799/4 : Robo-AO observations of binary stars (Riddle+, 2015)
J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)
J/AJ/147/123 : Speckle interferometry with SOAR in 2012-13 (Tokovinin+, 2014)
J/AJ/144/56 : Speckle interferometry at SOAR in 2012 (Tokovinin+, 2012)
J/AJ/143/42 : Speckle interferometry at SOAR in 2010 & 2011 (Hartkopf+, 2012)
J/ApJ/734/70 : Chromospheric activity of Southern stars (Arriagada, 2011)
J/AJ/139/743 : Speckle interferometry in 2008-09 (Tokovinin+, 2010)
J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999)
J/A+AS/123/93 : Lambda Boo stars consolidated catalogue (Paunzen+ 1997)
J/AJ/106/773 : Mass-luminosity relation (Henry+, 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS Washington Double Star (WDS) catalog code
(Cat. B/wds)
12- 17 I6 --- HIP Hipparcos number (Cat. I/239)
18 A1 --- m_HIP [B] Multiplicity index on HIP
20- 27 A8 --- Disc Discoverer designation (system identifier
adopted in the WDS)
28- 32 A5 --- Comp Component(s)
34- 39 F6.3 yr Per [0.96/82.3] Orbital period
41- 46 F6.3 yr e_Per [0.001/30.8]? Uncertainty in Per (1)
48- 55 F8.3 yr T0 [1987.8/2020.3] Epoch of periastron in Besselian
years (T0)
57- 61 F5.3 yr e_T0 [0.003/4.4]? Uncertainty in T0 (1)
63- 68 F6.4 --- e [0.02/0.92] Eccentricity
70- 75 F6.4 --- e_e [0.0014/0.19]? Uncertainty in e (1)
77- 82 F6.4 arcsec a [0.046/0.58] Semimajor axis
84- 89 F6.4 arcsec e_a [0.0007/0.072] Uncertainty in a (1)
91- 95 F5.1 deg Omega [13/356.7] Position angle of node Ω (2)
97-100 F4.1 deg e_Omega [0.3/74.2] Uncertainty in Omega (1)
102-106 F5.1 deg omega [13.7/349.5] Argument of periastron ω
108-111 F4.1 deg e_omega [0.3/66.6]? Uncertainty in omega (1)
113-117 F5.1 deg i [18.8/154.2] Inclination
119-122 F4.1 deg e_i [0.4/17.4]? Uncertainty in i (1)
124 I1 --- Gr1 [2/5] Orbital element grade (from 2=good to
5=indeterminate) (3)
126 I1 --- Gr2 [1/4]? Alternate orbital element grade including
radial velocity data (from 1=definitive to
4=preliminary) (3)
129-144 A16 --- Ref References to previously computed visual and
spectroscopic orbits; in refs.dat file
146-148 A3 --- f_Ref [abc,] Flag on Ref (4)
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Note (1): The presence of a blank or "null" value in the error column (e.g.,
e_Per, e_T0, e_e, e_omega, or e_i) means that that orbit is not well
constrained by the data, and that some orbital element (e.g., Per, T0, e,
omega, or i) is *fixed* to the value that results in the expected mass sum,
given the HIP2 parallax (Table3).
Note (2): For the equinox J2000.0.
Note (3):
Provisional orbital element grades are assigned based on the
principles described in the Sixth Catalog of Visual Binary Orbits (VB6)
(http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6), where
grades 4 and 5 mean preliminary orbits and grade 1 are definitive and
accurate orbits. Alternative unofficial grades are provided for orbits
where the radial velocity data strengthen combined visual-spectroscopic
orbits:
1 = definitive;
2 = good;
3 = reliable;
4 = preliminary;
5 = indeterminate.
Note (4): Flag on reference are defined as follows:
a = See Figure 1;
b = Insufficient coverage;
c = Combined orbit using the radial velocities.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS Washington Double Star (WDS) catalog code
(Cat. B/wds)
12- 20 F9.4 yr Date [1911/2017.54] Time of observation in
Besselian year (T)
22- 26 F5.1 deg PA [0.4/358.6] Position angle θ (1)
28- 33 F6.4 arcsec Sep [0.015/0.68] Separation ρ
35- 40 F6.4 arcsec Err [0.002/2.2] Measurement error σ (2)
42- 46 F5.1 deg (O-C)t [-42.4/37.4] Residual in angle O-Cθ
48- 54 F7.4 arcsec (O-C)r [-0.13/0.12] Residual in separation O-Cρ
56 A1 --- Sce [HIMS] Source of the data (Flag) (3)
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Note (1): For the time of observation (correction for precession is done
internally during orbit calculation).
Note (2): Unrealistically large errors are assigned to the discarded
observations, to give them zero weight, but those data but are still kept
in the table.
Note (3): Data source codes are defined as follows:
I = Interferometric measures from INT4 (Fourth Catalog of Interferometric
Measurements of Binary Stars; see Hartkopf et al. 2001AJ....122.3480H 2001AJ....122.3480H),
http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/int4/
H = Hipparcos measure;
M = Historic micrometer measures;
S = Speckle interferometry measure at SOAR.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS Washington Double Star (WDS) catalog code
(Cat. B/wds)
12- 17 I6 --- HIP Hipparcos number (Cat. I/239)
18 A1 --- m_HIP [B] Multiplicity index on HIP
20- 28 A9 --- SpT Spectral type (Hipparcos or Simbad)
30- 34 F5.1 mas Hplx [4/107.8] HIP2 (van Leeuwen 2007, Cat. I/311)
parallax πHIP2
36- 40 F5.1 mas Dplx [6/118.5]? Dynamical parallax πdyn (5)
41 A1 --- f_Dplx [*] Asterisks mark dynamical parallaxes for
orbits with grade ≥3
43- 46 F4.2 Msun Mass1 [0.25/2.62] Mass of primary component M1 (5)
47 A1 --- u_Mass1 [:] Uncertainty flag on Mass1
49- 52 F4.2 Msun Mass2 [0.15/2.3] Mass of secondary component (5)
53 A1 --- u_Mass2 [:] Uncertainty flag on Mass2
55- 59 F5.2 mag Vmag [4.67/13.6] The combined V-band magnitude,
from HIP mostly
61- 64 F4.2 mag V-Ic [0.18/2.7]? The (V-IC) color index, from HIP
mostly
66- 69 F4.2 mag <Dymag> [0.09/5.17]? Average Δy magnitude (6)
71- 74 F4.2 mag s_<Dymag> [0.04/0.74]? rms scatter of Δy magnitude
σΔy (6)
76- 79 F4.2 mag <DImag> [0.2/3.8]? Average ΔI magnitude (6)
81- 84 F4.2 mag s_<DImag> [0.02/1.25]? rms scatter of ΔI magnitude
σΔI (6)
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Note (5): The dynamical parallax is evaluated by the Baize-Romani method, from
Paper I (Tokovinin et al. 2016, Cat. J/AJ/152/138), which is used it to
evaluate the absolute V magnitudes of both components, and estimate their
masses Mass1 and Mass2 by means of the standard relation by Henry &
McCarthy 1993 (Cat. J/AJ/106/773). The new mass sum leads to the new value
of Dplx, and the iterations converge.
Note (6): Differential photometry resulting from the SOAR speckle
interferometry, where the filters y and I have central wavelengths and
bandwidths of 543/22 and 788/132nm, respectively.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS Washington Double Star (WDS) catalog code
(Cat. B/wds)
12-1966 A1955 --- Note Note on binary
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Ref Reference code
10- 27 A18 --- Aut Author's name
29- 47 A19 --- BibCode Bibliographic code
49-136 A88 --- Com Comments
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History:
From electronic version of the journal
References:
Tokovinin et al., Paper I 2016AJ....152..138T 2016AJ....152..138T, Cat. J/AJ/152/138
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 22-Jan-2018