J/AJ/158/48 Speckle interferometry at SOAR in 2018 (Tokovinin+, 2019)
Speckle interferometry at SOAR in 2018.
Tokovinin A., Mason B.D., Mendez R.A., Horch E.P., Briceno C.
<Astron. J., 158, 48 (2019)>
=2019AJ....158...48T 2019AJ....158...48T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Binaries, orbits ; Interferometry ;
Photometry, VRI ; Associations, stellar
Keywords: binaries: visual
Abstract:
The results of speckle interferometric observations at the 4.1 m Southern
Astrophysical Research Telescope (SOAR) in 2018 are given, totaling
3097 measurements of 2427 resolved pairs with separations from 11 mas
to 5.9" (median 0.15", magnitude difference up to 7 mag) and nonresolutions
of 624 targets. This work continues our long-term speckle program. Its
main goal is to monitor orbital motion of close binaries, including members
of high-order hierarchies and Hipparcos pairs in the solar neighborhood.
Also, pre-main-sequence stars in the Orion OB1 association were surveyed,
resolving 26 out of 118 targets. In addition, we report the discovery
of 35 new companions among field visual multiples (some of which are likely
optical) and first-time resolutions of another 31 pairs. By combining
the measurements given here with the published ones, we computed 76 orbits
for the first time and updated orbital elements of 34 visual binaries.
Their periods range from 0.65 to 1100 yr, and their quality varies from
first tentative solutions of grade 5 to accurate elements of grades 1
and 2. Finally, a list of 53 spurious pairs discovered by various
techniques and unresolved at SOAR is given.
Description:
The observations reported here were obtained with the HRCam - a fast
imager designed to work at the 4.1 m SOAR telescope (Tokovinin
2018PASP..130c5002T 2018PASP..130c5002T). The camera was mounted on the SOAR Adaptive Module
(SAM; Tokovinin et al. 2016AJ....152..116T 2016AJ....152..116T). However, the laser guide star
of SAM was not used (except in 2016 January); the deformable mirror of
SAM was passively flattened and the images are seeing-limited. In most
observing runs, the median image size was ∼0.6". The SAM module contains
the atmospheric dispersion corrector. The transmission curves of the HRCam
filters are given in the instrument manual. We used mostly the Stroemgren
y filter (543/22 nm) and the near-infrared I filter (824/170 nm). A few
measures were made in the V (517/84 nm) and R (596/121 nm) filters. The
detector is the electron multiplication CCD iXon-888. Observations in
2016 used a different detector (Luca-DL), and the I-band response was
788/132 nm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 124 3097 Measurements of double stars at SOAR
table3.dat 88 731 Unresolved stars
table4.dat 33 26 New pairs in Orion OB1
table5.dat 48 36 New visual multiple systems
table6.dat 40 31 New double stars
table7.dat 147 110 Visual orbits
table8.dat 60 53 Spurious pairs
refs.dat 160 236 List of references
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AJ/139/743 : Speckle interferometry in 2008-09 (Tokovinin+, 2010)
J/AJ/143/42 : Speckle interferometry with SOAR in 2010 + 2011
(Hartkopf+, 2012)
J/AJ/144/56 : Speckle interferometry at SOAR in 2012 (Tokovinin+, 2012)
J/AJ/147/123 : Speckle interferometry with SOAR in 2012-2013 (Tokovinin+, 2014)
J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)
J/AJ/151/153 : Speckle interferometry at SOAR in 2015 (Tokovinin+, 2016)
J/AJ/152/138 : Orbits based on speckle interferometry at SOAR (Tokovinin, 2016)
J/AJ/154/110 : Orbits based on SOAR speckle interferometry. II.
(Tokovinin, 2017)
J/AJ/155/235 : Speckle interferometry at SOAR in 2016 and 2017
(Tokovinin+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 21 A10 --- Disc Discoverer code
23- 27 A5 --- Comp Components designation
29- 40 A12 --- OName Other name
42- 49 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
51- 58 F8.4 deg DEdeg Declination in decimal degrees (J2000)
60- 68 F9.4 yr Epoch [2016.0423/2018.9756] Epoch of observation
(expressed as a fractional Julian year)
70 A1 --- Filt [VRIy] Filter used
72 I1 --- Nobs [1/7] Number of observation(s) used
74- 78 F5.1 deg PA [0/359.7] Position angle θ
80- 83 F4.1 mas err [0/65.7] Internal error in tangential
direction
85- 90 F6.4 arcsec Sep [0.0119/5.9253] Separation ρ
92- 95 F4.1 mas e_Sep [0/65.7] The 1σ uncertainty in Sep
97-100 F4.1 mag Dm [-0.4/7.4] Magnitude difference of pair
Δm
102 A1 --- f_Dm [*:q] Flag on Dm (1)
104-108 F5.1 deg (O-C)PA [-70.8/268.7]? The (O-C) in PA
110-115 F6.3 arcsec (O-C)Sep [-0.291/0.953]? The (O-C) in Sep
117-124 A8 --- Ref Orbit reference code (see refs.dat file) (G1)
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Note (1): Flag as follows:
* = Δm and the true quadrant are determined from the resolved
long-exposure image;
: = Data are noisy and Δm is likely over-estimated, or tentative
resolution;
q = True quadrant is established from the shift-and-add (SAA) image.
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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 WDS identification (HHMMm+DDMM, J2000)
12- 21 A10 --- Disc Discoverer code
23- 27 A5 --- Comp Components designation
29- 40 A12 --- OName Other name
42- 49 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
51- 58 F8.4 deg DEdeg Declination in decimal degrees (J2000)
60- 68 F9.4 yr Epoch [2016.0424/2018.9754] Epoch of observation
(expressed as a fractional Julian year)
70 A1 --- Filt [Iy] Filter used
72 I1 --- Nobs [1/8] Number of observation(s) used
74- 78 F5.3 arcsec Sepmin [0.028/0.129] Angular resolution ρmin
80- 83 F4.2 mag Dm0.15 [0/5.41] The 5σ magnitude difference
at 0.15"
85- 88 F4.2 mag Dm1 [0/6.58] The 5σ magnitude difference at 1"
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 15 I4 --- CVSO [7/2001] CVSO number
17- 21 F5.3 arcsec Sep [0.086/3.72] Separation ρ
23- 27 F5.1 deg PA [32.1/328.6] Position angle θ
29- 31 F3.1 mag DImag [0/4.6] Magnitude difference in the I band ΔI
33 A1 --- Conf [*] Indicates subsequent confirmation in 2017-2018
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 20 A9 --- Disc Discoverer code
22- 25 A4 --- CompOut Components designation of the outer pair
27 A1 --- FlagOut [*] Indicates new subsystem
29- 34 F6.2 arcsec SepOut [0.21/625] Outer separation ρout
36- 41 A6 --- CompIn Components designation of the inner pair
43 A1 --- FlagIn [*] Indicates new subsystem
45- 48 F4.2 arcsec SepIn [0.04/1.34] Inner separation ρin
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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- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 23 A12 --- OName Other name
25- 28 F4.2 arcsec Sep [0.04/1.63] Separation ρ
30- 32 F3.1 mag Dm [0/5.6] Magnitude difference Δm
34- 40 A7 --- Prog Observing program code (1)
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Note (1): Observing program code as follows:
EH = Pair resolved previously by E.H. at the WIYN telescope;
HIP = Hipparcos binary;
SB2 = Double-lined spectroscopic binary;
Ref = Reference star;
Ori = Member of Orion OB1 association;
MSC = Multiple system.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 19 A8 --- Disc Discoverer code
21- 26 A6 --- Comp Components designation
28- 33 I6 --- HIP [4448/116384]? Hipparcos number
35- 42 F8.3 yr Per [0.652/1100] Period
44- 49 F6.3 yr e_Per [0.001/57]? Uncertainty in Per
51 A1 --- f_Per [f] f for fixed
53- 60 F8.3 yr T [1908.67/2092.6] Time of periastron passage
62- 66 F5.3 yr e_T [0.021/9.3]? Uncertainty in T
68- 72 F5.3 --- e [0/0.98] Eccentricity
74- 78 F5.3 --- e_e [0.003/0.159]? Uncertainty in e
80 A1 --- f_e [f] f for fixed
82- 87 F6.4 arcsec a [0.0321/1.603] Semi-major axis
89- 94 F6.4 arcsec e_a [0.0006/0.067]? Uncertainty in a
96-101 F6.2 deg Omega [0.1/345.4] Longitude of ascending node Ω
103-107 F5.2 deg e_Omega [0.3/25]? Uncertainty in Omega
109-114 F6.2 deg omega [-1.1/352.3] Argument of periastron ω
116-119 F4.1 deg e_omega [0.4/67.8]? Uncertainty in omega
121 A1 --- f_omega [f] f for fixed
123-127 F5.1 deg i [0/192.3] Inclination
129-132 F4.1 deg e_i [0.3/19.4]? Uncertainty in i
134 A1 --- f_i [f] f for fixed
136 I1 --- Grade [1/5] Provisional grade of orbit (1 for accurate
orbit)
138-145 A8 --- Ref Reference to previous orbit (see refs.dat file)
(G1)
147 A1 --- Flag [*] Indicates orbits where radial velocities
from the literature are used jointly with
position measures
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 18 A7 --- Disc Discoverer code
20- 25 A6 --- Comp Components designation
27- 30 F4.2 arcsec Sep [0.02/3] Separation
32- 34 A3 --- Tech Measurement technique (1)
36- 39 I4 yr Year1r [1897/2015]? First year when the pair was
resolved
41- 44 I4 yr Year2r [1927/2016]? Second year when the pair was
resolved
46- 49 I4 yr Year1nr [1976/2018]? First year of nonresolution at SOAR
51- 54 I4 yr Year2nr [2017/2018]? Second year of nonresolution at SOAR
56- 60 A5 --- Note Additional hint coded by letters (2)
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Note (1): Measurement technique as follows:
Vis = Visual;
Sp = Speckle;
HIP = Hipparcos;
Tyc = Tycho;
Occ = Lunar occultations.
Note (2): Additional indications of the spurious nature of visual pairs:
DR2 = Parallax provided by Gaia DR2 (Cat. I/345);
OG = Optical ghost (Tokovinin et al. 2018, J/AJ/155/235);
L = Long estimated period;
S = Short estimated period or spectroscopic coverage;
Vib = Artifact caused by telescope vibration.
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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- 67 A58 --- Aut Author's name(s)
69- 87 A19 --- Bibcode Bibcode of the reference
89-160 A72 --- Com Comment
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Global notes:
Note (G1): Reference codes for this Table are also available at
http://ad.usno.navy.mil/wds/orb6/wdsref.txt.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 11-Sep-2019