J/AJ/155/235 Speckle interferometry at SOAR in 2016 and 2017 (Tokovinin+, 2018)
Speckle interferometry at SOAR in 2016 and 2017.
Tokovinin A., Mason B.D., Hartkopf W.I., Mendez R.A., Horch E.P.
<Astron. J., 155, 235 (2018)>
=2018AJ....155..235T 2018AJ....155..235T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Interferometry ; Photometry, VRI ;
Spectral types ; Parallaxes, trigonometric
Keywords: binaries: visual
Abstract:
The results of speckle interferometric observations at the 4.1 m Southern
Astrophysical Research Telescope in 2016 and 2017 are given, totaling
2483 measurements of 1570 resolved pairs and 609 non-resolutions. We
describe briefly recent changes in the instrument and observing method
and quantify the accuracy of the pixel scale and position angle
calibration. Comments are given on 44 pairs resolved here for the first
time. The orbital motion of the newly resolved subsystem BU 83 Aa,Ab
roughly agrees with its 36-year astrometric orbit proposed by J. Dommanget.
Most Tycho binaries examined here turned out to be spurious.
Description:
The observations reported here were obtained with the high-resolution
camera (HRCam) - a fast imager designed to work at the 4.1 m SOAR telescope
(Tokovinin & Cantarutti 2008PASP..120..170T 2008PASP..120..170T; Tokovinin 2018PASP..130c5002T 2018PASP..130c5002T).
For practical reasons, the camera was mounted on the SOAR Adaptive Module
(SAM, Tokovinin et al. 2016PASP..128l5003T 2016PASP..128l5003T). However, the laser guide star
of SAM was not used (except in 2016 January) because it was not needed and,
moreover, reduced the productivity by adding an overhead. The deformable
mirror of SAM was passively flattened and the images are seeing-limited.
The SAM module contains the atmospheric dispersion corrector (ADC) and
helps to calibrate the pixel scale and orientation of HRCam (see SOAR14).
The transmission curves of HRCam filters are given in the instrument manual.
We used mostly the Stromgren y filter (543/22 nm) and the near-infrared
I filter (788/132 nm).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 102 2483 Measurements of double stars at SOAR
table4.dat 69 612 Unresolved stars
table5.dat 81 44 Newly resolved pairs
refs.dat 83 163 List of references
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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/337 : Gaia DR1 (Gaia Collaboration, 2016)
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)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS idenfitication (HHMMm+DDMM, J2000)
12- 19 A8 --- Disc Discoverer designation
21- 25 A5 --- Comp Components designation
27- 36 A10 --- OName Other name
38- 46 F9.4 yr Epoch [2009.6693/2017.83] Epoch of observation
(expressed as a fractional Julian year)
48 A1 --- Filt [VRIy] Filter used
50 I1 --- Nobs [1/7] Number of observation(s) used
52- 56 F5.1 deg PA [0/359.9] Position angle θ
58- 61 F4.1 mas err [0/27.9] Internal error in tangential
direction (pσθ)
63- 68 F6.4 arcsec Sep [0.0176/4.1081] Separation ρ
70- 73 F4.1 mas e_Sep [0/27.8] The 1σ uncertainty in Sep
75- 78 F4.1 mag Dmag [0/7.6] Magnitude difference of pair Δm
80 A1 --- f_Dmag [*:q] Flag on Dmag (G1)
82- 86 F5.1 deg (O-C)PA [-92.4/260.4]? The (O-C) in PA
88- 93 F6.3 arcsec (O-C)Sep [-0.544/0.304]? The (O-C) in Sep
95-102 A8 --- Ref Reference code (see refs.dat file) (1)
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Note (1): Reference codes for this Table are also available at
http://ad.usno.navy.mil/wds/orb6/wdsref.txt.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS idenfitication (HHMMm+DDMM, J2000)
12- 21 A10 --- Disc Discoverer designation
23- 27 A5 --- Comp Components designation
29- 38 A10 --- OName Other name
40- 48 F9.4 yr Epoch [2016.0481/2017.83] Epoch of observation
(expressed as a fractional Julian year)
50 A1 --- Filt [RIyH] Filter used
52 I1 --- Nobs [1/4] Number of observation(s) used
54- 58 F5.3 arcsec Sepmin [0.028/0.214] Mininimum resolvable separation
ρmin
60- 63 F4.2 mag Dm0.15 [0/5.51] The 5σ magnitude difference
at 0.15" Δm(0.15")
65- 68 F4.2 mag Dm1 [0/7.15] The 5σ magnitude difference
at 1" Δm(1")
69 A1 --- f_Dmag [:] Flag for noisy data
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS idenfitication (HHMMm+DDMM, J2000)
12- 19 A8 --- Disc Discoverer designation
21- 25 A5 --- Comp Components designation
27- 37 A11 --- OName Other name
39- 45 F7.4 yr Epoch [16.133/17.8248] Epoch of observation (expressed
as a fractional Julian year, -2000)
47 A1 --- Filt [Iy] Filter used
49- 54 F6.2 deg PA [27.3/350.6] Position angle θ
56- 61 F6.4 arcsec Sep [0.0294/2.618] Separation ρ
63- 65 F3.1 mag Dmag [0.1/6.1] Magnitude difference of pair Δm
66 A1 --- f_Dmag [*:q] Flag on Dmag (G1)
68- 75 A8 --- SpType Spectral type (as given in SIMBAD)
77- 80 F4.1 mas Plx [1.2/44.5]? The Hipparcos parallax
(van Leeuwen 2007, Cat. I/311)
81 A1 --- f_Plx [*] Denotes a Gaia parallax
(Gaia Collaboration et al. 2016, Cat. I/337)
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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- 41 A32 --- Aut Author's name(s)
43- 61 A19 --- Bibcode Bibcode of the reference
63- 83 A21 --- Com Comment on the reference
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Global notes:
Note (G1): 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 (see Tokovinin et al.
2010, J/AJ/139/743 for details);
q = True quadrant is established from the shift-and-add (SAA) image
(Section 2.4).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 14-Dec-2018