J/AJ/144/56 Speckle interferometry at SOAR in 2012 (Tokovinin+, 2012)
Speckle interferometry and orbits of "fast" visual binaries.
Tokovinin A.
<Astron. J., 144, 56 (2012)>
=2012AJ....144...56T 2012AJ....144...56T
ADC_Keywords: Stars, double and multiple ; Interferometry
Keywords: binaries: general - techniques: interferometric
Abstract:
Results of speckle observations at the 4.1m SOAR telescope in 2012
(158 measures of 121 systems, 27 non-resolutions) are reported. The
aim is to follow fast orbital motion of recently discovered or
neglected close binaries and sub-systems. Here, eight previously known
orbits are defined better, two more are completely revised, and five
orbits are computed for the first time. Using differential photometry
from Hipparcos or speckle and the standard relation between mass and
absolute magnitude, the component's masses and dynamical parallaxes
are estimated for all 15 systems with new or updated orbits. Two
astrometric binaries HIP 54214 and 56245 are resolved here for the
first time, another eight are measured. We highlight several
unresolved pairs that may actually be single despite multiple historic
measures, such as 104 Tau and f Pup AB. Continued monitoring is needed
to understand those enigmatic cases.
Description:
The observations were obtained with the high-resolution camera (HRCam,
a fast imager designed to work at the 4.1m SOAR telescope) with the
SOAR Adaptive Module (SAM) or as a stand-alone instrument.
Speckle interferometry of binary stars was carried out during five
runs of the SAM instrument, from 2011 December to 2012 May.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 159 Measurements of binary stars at 4.1m SOAR
(Southern Astrophysical Research) telescope
refs.dat 68 35 Reference
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2013)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
V/39 : 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
J/AJ/144/7 : NIR imaging of HIP astrometric binaries (Tokovinin+, 2012)
J/AJ/143/42 : SOAR speckle interferometry in 2010 & 2011 (Hartkopf+, 2012)
J/AJ/139/743 : Speckle interferometry in 2008-09 (Tokovinin+, 2010)
J/A+A/464/377 : HIP binaries with radial velocities (Frankowski+, 2007)
J/AJ/133/1209 : 14 visual double stars orbits & system masses (Docobo+, 2007)
J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)
J/A+A/442/365 : Astrometric orbits of SB9 stars (Jancart+, 2005)
J/AJ/127/1727 : Differential magnitudes of binary stars (Horch+, 2004)
J/AJ/123/1023 : Binary star orbits (Seymour+, 2002)
J/AJ/121/3224 : Speckle interferometry of HIP binaries (Mason+, 2001)
J/A+A/367/865 : Speckle observations of binary systems (Prieur+ 2001)
J/AJ/119/3084 : ICCD speckle obs. of binary stars. XXIII. (Hartkopf+, 2000)
J/A+A/341/121 : Visual binary orbits and masses (Soederhjelm 1999)
J/AJ/111/370 : Orbits of 37 close visual systems (Hartkopf+ 1996)
J/A+AS/105/503 : Binary star speckle measurements (Balega+ 1994)
J/AJ/106/1639 : Speckle observations of binary stars (McAlister+ 1993)
http://ad.usno.navy.mil/wds/orb6.html : Sixth Catalog of Orbits of Visual
Binary Stars (VB6)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS identification (HHMMm+DDMM, J2000)
12- 25 A14 --- Disc Discoverer designation as adopted in the WDS
27- 29 A3 --- --- [HIP]
30- 35 I6 --- HIP ? Hipparcos identifier (from Cat. I/239)
37- 45 A9 --- OName Other name (mostly HD designation)
47- 55 F9.4 yr Epoch Besselian epoch of observation
57- 58 A2 --- Filt Filter used (I=near-infrared I filter,
y=Stromgren y filter (543/22nm),
Ha=Hα, or R)
60 I1 --- N [1/3] Number of observations used
62- 66 F5.1 deg PA Position angle θ (not precessed) (1)
68- 70 F3.1 mas err Internal measurement error in tangential
direction (ρσθ)
72- 77 F6.4 arcsec Sep Separation ρ (1)
79- 82 F4.1 mas e_Sep Internal error in Sep (σρ)
84- 86 F3.1 mag Dmag [0/5.4] Magnitude difference of pair
Δm (1)
88 A1 --- f_Dmag [*:] Flag on Dmag (2)
90- 94 F5.1 deg (O-C)PA ? The (O-C) in PA [O-C]θ (3)
96-101 F6.3 arcsec (O-C)Sep ? The (O-C) in Sep [O-C]ρ (3)
103 A1 --- f_Ref [*] revised orbit (4)
104-112 A9 --- Ref Reference to the orbit, in refs.dat file (5)
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Note (1): In the cases of multiple stars, the positions and photometry
refer to the pairings between individual stars, not with photocenters
of sub-systems.
Note (2): Flag on Dmag as follows:
* = Magnitude difference and the true quadrant are determined from the
resolved long-exposure image;
: = data are noisy and magnitude difference is likely over-estimated
See Tokovinin et al. (2010, Cat. J/AJ/139/743) for details.
Note (3): For stars with known orbital elements.
Note (4): the asterisk marks references to the orbits revised here are
preceded by asterisk; large residuals to those orbits show why the
revisions were needed.
Note (5): For stars with known orbital elements, the code of reference to
the orbit adopted in the Sixth Orbit Catalog of Orbits of Visual Stars
(VB6, Hartkopf et al., 2001AJ....122.3472H 2001AJ....122.3472H ). See
http://ad.usno.navy.mil/wds/orb6/wdsref.html.
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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- 28 A19 --- BibCode Bibliographic code
30- 49 A20 --- Aut Author's name
51- 68 A18 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 07-Oct-2013