J/AJ/152/138 Orbits based on speckle interferometry at SOAR (Tokovinin, 2016)
New orbits based on speckle interferometry at SOAR.
Tokovinin A.
<Astron. J., 152, 138-138 (2016)>
=2016AJ....152..138T 2016AJ....152..138T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Binaries, orbits ; Interferometry
Keywords: binaries: visual - stars: low-mass
Abstract:
The orbits of 55 visual binary stars are computed using recent speckle
interferometry data from the SOAR telescope: 33 first-time orbits and
22 revisions of previous orbit calculations. The orbital periods range
from 1.4-370 years, and the quality of the orbits ranges from
definitive to preliminary and tentative. Most binaries consist of
low-mass dwarfs and have short periods (median period 31 years). The
dynamical parallaxes and masses are evaluated and compared to the
Hipparcos parallaxes. Using differential speckle photometry, binary
components are placed on the color-magnitude diagram.
Description:
This paper presents new or updated orbits for 55 binary systems or
subsystems. It is based on speckle interferometric measurements made
at the 4.1m Southern Astrophyisical Research (SOAR) telescope combined
with archival data collected in the Washington Double Star Catalog
(WDS; Mason et al. 2001-2014, Cat. B/wds).
Table1 lists the orbital elements and their errors in common notation.
Individual observations and residuals are listed in Table2. It
contains still unpublished measures made at SOAR in 2016, while some
published SOAR measures were reprocessed. Table3 provides additional
information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 151 55 Orbital elements
table2.dat 55 699 Observations and residuals
table3.dat 79 55 Parallaxes and photometry
notes.dat 896 35 Notes on individual binaries
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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)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
V/39 : 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
J/AJ/150/151 : DSSI observations of binaries. VI. (Horch+, 2015)
J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)
J/AJ/147/123 : 2012-2013 speckle interferometry with SOAR (Tokovinin+, 2014)
J/A+A/559/A17 : Barycentric radial velocities of Gl 586A (Strassmeier+, 2013)
J/AJ/144/56 : Speckle interferometry at SOAR in 2012 (Tokovinin+, 2012)
J/AJ/144/7 : Imaging of Hipparcos astrometric binaries (Tokovinin+, 2012)
J/AJ/139/743 : Speckle interferometry in 2008-09 (Tokovinin+, 2010)
J/ApJS/105/475 : Observations of double stars. XVII. (Heintz 1996)
J/ApJS/99/135 : Rotation and Spectral Peculiarities (Abt+ 1995)
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 Code of the binary in the Washington Double Star
catalog (cat. B/wds)
12- 19 A8 --- Disc Discoverer designation (system identifier adopted
in the WDS)
21- 25 A5 --- Comp Component(s)
27- 35 F9.5 yr Per [1.421/373.7] Orbital period
37- 45 F9.4 yr T0 [1920.6/2189.08] Epoch of periastron T0
47- 51 F5.3 --- e [0.01/0.976] Eccentricity
53- 58 F6.4 arcsec a [0.0324/1.53] Semimajor axis
60- 64 F5.1 deg Omega [4/351.5] Position angle of node Ω (1)
66- 70 F5.1 deg omega [-0.3/359.5] Argument of periastron ω
72- 76 F5.1 deg i [34/169] Inclination
78 I1 --- Gr [1/5] Orbital element grade (from 1=definitive to
5=indeterminate) (2)
80- 87 A8 --- Ref References to previously computed orbits (3)
89- 91 A3 --- f_Ref Flag on Ref (a=insufficient coverage, and/or
b=see Figure1)
92- 97 I6 --- HIP [20048/109561]? Hipparcos number (Cat. I/239),
when available
99-104 F6.3 yr e_Per [0.002/15.772]? Uncertainty in Per
106 A1 --- f_Per [f] Flag on Per (f=fixed)
108-113 F6.3 yr e_T0 [0.01/51]? Uncertainty in T0
115 A1 --- f_T0 [f] Flag on T0 (f=fixed)
117-121 F5.3 --- e_e [0.004/0.35]? Uncertainty in e
123 A1 --- f_e [f] Flag on e (f=fixed)
125-130 F6.4 arcsec e_a [0.0009/0.19]? Uncertainty in a
132-136 F5.1 deg e_Omega [0.4/103.7]? Uncertainty in Omega
138-142 F5.1 deg e_omega [0.8/157.7]? Uncertainty in omega
144 A1 --- f_omega [f] Flag on omega (f=fixed)
146-149 F4.1 deg e_i [0.2/34.1]? Uncertainty in i
151 A1 --- f_i [f] Flag on i (f=fixed)
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Note (1): For the equinox J2000.0.
Note (2):
Provisional grades are assigned based on the principles described in
the Sixth Catalog of Visual Binary Orbits
(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:
1 = definitive;
2 = good;
3 = reliable;
4 = preliminary;
5 = indeterminate.
Note (3): Orbit reference codes are defined as follows:
B_1961d = van den Bos (1961CiUO..120..380V 1961CiUO..120..380V);
Baz1989a = Baize (1989A&AS...78..125B 1989A&AS...78..125B);
Doc2005f = Docobo & Ling (2005IAUDS.157R...1D 2005IAUDS.157R...1D);
Doc2013d = Docobo & Andrade (2013MNRAS.428..321D 2013MNRAS.428..321D);
Hei1981a = Heintz (1981ApJS...45..559H 1981ApJS...45..559H);
Hei1992b = Heintz & Cantor (1992Obs...112..286H 1992Obs...112..286H);
Hei1996a = Heintz 1996 (Cat. J/ApJS/105/475);
Hei1997 = Heintz (1997ApJS..111..335H 1997ApJS..111..335H);
Hor2011b = Horch et al. 2011 (Cat. J/AJ/150/151);
Hrt2011d = Hartkopf & Mason 2011, IAUDS, 175, 1;
Koh2002 = Koehler & Petr-Gotzens (2002AJ....124.2899K 2002AJ....124.2899K);
Ole2004b = Olevic & Cvetkovic (2004A&A...415..259O 2004A&A...415..259O);
Tok2014a = Tokovinin et al. 2014 (Cat. J/AJ/147/123);
Tok2015c = Tokovinin et al. 2015 (Cat. J/AJ/150/50);
Zir2014a = Zirm 2014, IAUDS, 182, 1.
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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 Code of the binary in the Washington Double Star
catalog (cat. B/wds)
12- 20 F9.4 yr Date [1885.76/2016.4] Time of observation in
Besselian year (T)
22- 26 F5.1 deg PA [-4/361.9] Position angle (θ) (1)
28- 33 F6.4 arcsec Sep [0.01/1.56] Separation (ρ)
35- 41 F7.4 arcsec Err [0.001/10.1] Measurement error (σ) (2)
43- 47 F5.1 deg (O-C)t [-88.9/159.1] Residual in angle (O-Cθ)
49- 55 F7.4 arcsec (O-C)r [-0.2/0.32] Residual in separation (O-Cρ)
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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, so that they have no influence on the fitted elements, but
are still kept in the table.
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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 Code of the binary in the Washington Double Star
catalog (cat. B/wds)
12- 17 I6 --- HIP ? Hipparcos number (Cat. I/239)
19- 29 A11 --- SpT Spectral type (4)
31- 34 F4.1 mas Hplx [1.4/55.7]? HIP2 (van Leeuwen, 2007, Cat. I/311)
parallax (πHIP2)
36- 39 F4.1 mas Dplx [2.6/51.4] Dynamical parallax (πdyn) (5)
40 A1 --- f_Dplx [*] Asterisks mark the dynamical parallaxes
derived from reliable orbits of grade 3 or
better
42- 44 F3.1 Msun Mass1 [0.7/4.2] Mass of primary component (5)
46- 48 F3.1 Msun Mass2 [0.5/4.1] Mass of secondary component (5)
50- 54 F5.2 mag Vmag [4.54/10.46] The combined V-band magnitude (6)
56- 59 F4.2 mag V-I [0.05/1.47]? The (V-Ic) color index (6)
61- 64 F4.2 mag Dymag [0.05/3.98]? Average Δy magnitude (7)
66- 69 F4.2 mag s_Dymag [0.04/0.87]? The rms scatter of magnitude
difference in y filter if measured several
times (σΔy) (8)
71- 74 F4.2 mag DImag [0.07/2.94]? Average ΔI magnitude (7)
76- 79 F4.2 mag s_DImag [0.01/0.52]? The rms scatter of magnitude
difference in I filter if measured several
times (σΔI) (8)
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Note (4): As given in Hipparcos or SIMBAD.
Note (5):
The dynamical parallax is evaluated by the Baize-Romani method,
applicable when binary components follow the standard main-sequence
relation between mass and absolute magnitude. Taking the initial mass sum
Mass=2M☉, we compute the dynamical parallax
πdyn=aMass-1/3P-2/3,
use 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), valid for Mass<2M☉ and
extrapolated to larger masses in a few cases. The new mass sum leads to the
new value of πdyn, and the iterations converge rapidly.
Note (6): Taken mostly from the Hipparcos catalog. For HIP 83716B and 87914B,
the combined magnitudes refer to the secondary subsystems, while
V-Ic=1.0mag is assumed to match the estimated spectral type K0V of both
pairs.
Note (7): 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.
Note (8): Indicating internal consistency of the differential photometry. For
some pairs, this scatter is as good as 0.1mag, but it can be up to ∼0.5mag.
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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- 10 A10 --- WDS WDS designation
12-896 A885 --- Note Notes on binary
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History:
From electronic version of the journal
References:
Tokovinin et al., Paper II 2017AJ....154..110T 2017AJ....154..110T, Cat. J/AJ/154/110
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 13-Mar-2017