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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 (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 It contains still unpublished measures made at SOAR in 2016, while some published SOAR measures were reprocessed.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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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); Baz1989a = Baize (1989A&AS...78..125B); Doc2005f = Docobo & Ling (2005IAUDS.157R...1D); Doc2013d = Docobo & Andrade (2013MNRAS.428..321D); Hei1981a = Heintz (1981ApJS...45..559H); Hei1992b = Heintz & Cantor (1992Obs...112..286H); Hei1996a = Heintz 1996 (Cat. J/ApJS/105/475); Hei1997 = Heintz (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); Ole2004b = Olevic & Cvetkovic (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.
Byte-by-byte Description of file: table2.dat
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)
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.
Byte-by-byte Description of file: table3.dat
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)
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.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 10 A10 --- WDS WDS designation 12-896 A885 --- Note Notes on binary
History: From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 13-Mar-2017
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