J/AJ/164/58 Speckle Interferometry at SOAR in 2021 (Tokovinin+, 2022)
Speckle Interferometry at SOAR in 2021.
Tokovinin A., Mason B.D., Mendez R.A., Costa E.
<Astron. J., 164, 58 (2022)>
=2022AJ....164...58T 2022AJ....164...58T
ADC_Keywords: Stars, double and multiple; Positional data; Photometry, VRI
Keywords: Visual binary stars ; Orbital elements ; Multiple stars
Abstract:
The speckle interferometry program at the the 4.1m Southern
Astrophysical Research Telescope (SOAR), which started in 2008, now
has accumulated over 30300 individual observations of 12700 distinct
targets. Its main goal is to monitor orbital motion of close binaries,
including members of high-order hierarchies and low-mass dwarfs in the
solar neighborhood. The results from 2021 are published here, totaling
2623 measurements of 2123 resolved pairs and nonresolutions of 763
targets. The median measured separation is 0.21", and 75 pairs were
closer than 30mas. The calibration of scale and orientation is based
on the observations of 103 wide pairs with well-modeled motion. These
calibrators are compared to the latest Gaia data release, and minor
(0.5%) systematic errors were rectified, resulting in accurate
relative positions with typical errors on the order of 1mas. Using
these new measurements, orbits of 282 binaries are determined here (54
first determinations and 228 corrections). We resolved for the first
time 50 new pairs, including subsystems in known binaries. A list of
94 likely spurious pairs unresolved at SOAR (mostly close Hipparcos
binaries) is also given.
Description:
The observations reported here were obtained with the high-resolution
camera (HRCam) -- a fast imager designed to work at the 4.1m Southern
Astrophysical Research Telescope (SOAR) telescope. HRCam receives
light through the SOAR Adaptive Module (SAM), which provides
correction of the atmospheric dispersion. We used mostly the
near-infrared I filter (824/170nm) and the Stromgren y filter
(543/22nm), with four observations made in the V filter. In the
standard observing mode, two series of four hundred 200x200 pixel
images (image cubes) are recorded. The pixel scale is 0.01575", so the
field of view is 3.15"; the exposure time is normally 24ms.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 142 2623 Measurements of double stars at SOAR
table3.dat 98 907 Unresolved stars
table6.dat 137 174 Visual orbits with element's errors
table7.dat 88 108 Preliminary visual orbit
refs.dat 90 169 *Refences used for this work
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Note on refs.dat : Reference codes from
http://www.astro.gsu.edu/wds/orb6/wdsref.txt
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)
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 2012-2013 (Tokovinin+, 2014)
J/AJ/150/151 : DSSI observations binaries. VI. Measures in 2014 (Horch+, 2015)
J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)
J/A+A/597/A47 : CARMENES input catalogue of Mdwarfs II (Cortes-Contreras+ 2017)
J/AJ/153/212 : Observations of binary stars at WIYN telescope (Horch+, 2017)
J/AJ/155/235 : Speckle interferometry at SOAR in 2016&2017 (Tokovinin+, 2018)
J/AJ/157/56 : DSSI observations binary & trinary star systems (Horch+, 2019)
J/AJ/158/148 : Photometry of beta Lyr by BRITE satellites.II (Rucinski+, 2019)
J/AJ/158/222 : Orbits of subsystems in multiple stars. VI. (Tokovinin, 2019)
J/AJ/160/251 : Radial velocities & orbital, 5 triple stars (Tokovinin+, 2020)
J/AJ/160/7 : 2019 SOAR speckle interferometry of binaries (Tokovinin+, 2020)
J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)
J/ApJS/247/66 : SUPERWIDE; wide binaries in Gaia & SUPERBLINK (Hartman+, 2020)
J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)
J/AJ/161/134 : Survey of stellar & planetary comp. within 25pc (Hirsch+, 2021)
J/AJ/161/295 : Obs. Differential Speckle Survey Instrument. X. (Horch+, 2021)
J/AJ/161/144 : Inner & outer orbits in 13 multiple systems (Tokovinin, 2021)
J/AJ/162/41 : Speckle interferometry at SOAR in 2020 (Tokovinin+, 2021)
J/AJ/162/192 : SOAR TESS survey II. Impact stellar companions (Ziegler+, 2021)
J/AJ/163/178 : Solar Neighborhood XLIV. Mdwarfs with SOAR (Vrijmoet+, 2022)
J/AJ/163/161 : Spectro. Subsystems in Multiple Stars. VIII. (Tokovinin, 2022)
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 Idenfitication
12- 27 A16 --- Dis Discoverer Designation
29- 40 A12 --- OName Other name
42- 49 F8.4 deg RAdeg [0/360] Right ascension (J2000)
51- 58 F8.4 deg DEdeg [-89/30] Declination (J2000)
60- 68 F9.4 yr Epoch [2018/2022] Epoch of observation
70- 71 A2 --- Filt Filter used; I, V; y or HA
73- 74 I2 --- Num [1/6] Number of observations used
76- 83 F8.1 deg PA [0/360] Position angle
85- 89 F5.1 mas err [0/28] Internal error in tangential direction
91- 98 F8.4 arcsec Sep [0.01/6.72] Separation
100-104 F5.1 mas e_Sep [0/28] The 1σ uncertainty in Sep
106-112 F7.1 mag Dmag [-1.9/8.2] Magnitude difference of pair
114 A1 --- f_Dmag Flag on Dmag (1)
116-123 F8.1 deg O-CPA [-73.3/264]? The (O-C) in PA
125-132 F8.3 arcsec O-CSep [-0.23/0.39]? The (O-C) in Sep
134-142 A9 --- Ref Orbit reference code
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Note (1): Flags as follows:
* = Delm and the true quadrant are determined from the resolved
long-exposure image (469 occurrences)
: = data are noisy and Delm is likely over-estimated, or
tentative resolution (127 occurrences)
q = true quadrant is established from the SAA image (1050 occurrences)
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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 Idenfitication
12- 27 A16 --- Dis Discoverer Designation
29- 40 A12 --- OName Other name
42- 49 F8.4 deg RAdeg [0/360] Right ascension (J2000)
51- 58 F8.4 deg DEdeg [-86/30] Declination (J2000)
60- 68 F9.4 yr Epoch [2021/2022] Epoch of observation
70- 71 A2 --- Filt Filter used; I, y and Hα
73- 74 I2 --- Num [1/5] Number of observations used
76- 82 F7.3 arcsec AR [0.028/0.095] Angular resolution
84- 90 F7.2 mag Dmag0.15 [0/5.22] The 5σ magnitude difference at
0.15"
92- 98 F7.2 mag Dmag1 [0/6.85] The 5σ magnitude difference at 1"
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS Idenfitication
12- 27 A16 --- Dis Discoverer Designation
29- 36 F8.3 yr Porb [1.7/345] Orbital period
38- 45 F8.3 yr e_Porb [0/74.7] Orbital period error
47- 54 F8.3 yr T0 [1824/2137] Time of periastron passage
56- 63 F8.3 yr e_T0 [0.002/40] Error of T0
65- 69 F5.3 --- e [0/0.98] Orbital eccentricity
71- 75 F5.3 --- e_e [0/0.21] Error of orbital eccentricity
77- 82 F6.4 arcsec a [0.03/2.05] Semi-major axis of the orbit
84- 89 F6.4 arcsec e_a [0.0005/0.09] Error on a
91- 95 F5.1 deg Omega [2.9/352] Position angle of the node
97-101 F5.1 deg e_Omega [0.1/110] Error of position angle of the node
103-107 F5.1 deg omega [0/360] Longitude of periastron
109-113 F5.1 deg e_omega [0/120] Error of longitude of periastron
115-119 F5.1 deg i [0/180] Inclination
121-125 F5.1 deg e_i [0/33] Error of inclination
127 I1 --- Grade [1/5] Orbit grade
129-137 A9 --- Ref Reference to previous orbit
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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 Idenfitication
12- 27 A16 --- Dis Discoverer Designation
29- 36 F8.3 yr Porb [9/900] Orbital period
38- 45 F8.3 yr T0 [1695/2274] Time of periastron passage
47- 51 F5.3 --- e [0/0.98] Orbital eccentricity
53- 58 F6.4 arcsec a [0.06/3.63] Semi-major axis of the orbit
60- 64 F5.1 deg Omega [5.8/355] Position angle of the node
66- 70 F5.1 deg omega [0/356] Longitude of periastron
72- 76 F5.1 deg i [0/180] Inclination
78 I1 --- Grade [3/5] Orbit grade
80- 88 A9 --- Ref Reference to previous orbit
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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- 9 A9 --- Ref Reference code
11- 31 A21 --- Author Main author
33- 51 A19 --- BIB BIBcode
53- 68 A16 --- Cat. Catalog in Vizier
70- 90 A21 --- Note Additional note or comment
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 25-Oct-2022