J/AJ/140/1623 PHASES diff. astrometry data archive. II. (Muterspaugh+, 2010)
The PHASES differential astrometry data archive.
II. Updated binary star orbits and a long period eclipsing binary.
Muterspaugh M.W., Hartkopf W.I., Lane B.F., O'Connell J., Williamson M.,
Kulkarni S.R., Konacki M., Burke B.F., Colavita M.M., Shao M.,
Wiktorowicz S.J.
<Astron. J., 140, 1623-1630 (2010)>
=2010AJ....140.1623M 2010AJ....140.1623M
ADC_Keywords: Stars, double and multiple ; Positional data ; Interferometry
Keywords: astrometry - binaries: close - binaries: eclipsing -
binaries: visual - techniques: interferometric
Abstract:
Differential astrometry measurements from the Palomar High-precision
Astrometric Search for Exoplanet Systems have been combined with lower
precision single-aperture measurements covering a much longer timespan
(from eyepiece measurements, speckle interferometry, and adaptive
optics) to determine improved visual orbits for 20 binary stars. In
some cases, radial velocity observations exist to constrain the full
three-dimensional orbit and determine component masses. The visual
orbit of one of these binaries - α Com (HD 114378) - shows that
the system is likely to have eclipses, despite its very long period of
26 years. The next eclipse is predicted to be within a week of 2015
January 24.
Description:
PHASES differential astrometry measurements were obtained using the
observing method and standard data analysis pipeline described in
Paper I (Cat. J/AJ/140/1579). The measurements themselves and
associated measurement uncertainties are also tabulated in Paper I
(Cat. J/AJ/140/1579).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 30 20 Number of PHASES and Non-PHASES measurements and
unit-weight uncertainties for non-PHASES measurements
table2.dat 50 2936 Non-PHASES astrometric measurements
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See also:
J/AJ/140/1579 : PHASES diff. astrometry data archive. I. (Muterspaugh+, 2010)
J/AJ/140/1657 : PHASES diff. astrometry data archive. V. (Muterspaugh+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD star number
8- 9 I2 --- NP Number of PHASES measurements used for
orbit fitting
11 I1 --- NPO Number of non-PHASES astrometric measurements
used for orbit fitting
13- 15 I3 --- NNP Additional numbers of PHASES measurements
rejected as outliers
17- 18 I2 --- NNPO Additional numbers of non-PHASES measurements
rejected as outliers
20- 25 F6.4 arcsec e_rho 1sigma measurement uncertainties for unit-weight
measurements from non-PHASES observations
in ρ (1)
27- 30 F4.2 deg e_theta 1sigma measurement uncertainties for unit-weight
measurements from non-PHASES observations
in theta (1)
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Note (1): determined by iterating Keplerian fits to the measurements with
removal of 3sigma or greater outliers in either dimension.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD Star HD number
10- 18 F9.4 yr Date Decimal year of the measurement
20- 24 F5.3 arcsec rho Separation ρ
26- 31 F6.2 deg theta Position angle θ
33- 37 F5.3 arcsec e_rho The 1σ uncertainty in rho
39- 43 F5.2 deg e_theta The 1σ uncertainty in theta
45- 48 F4.1 --- w Measurement weight
50 I1 --- fO [0/1] Outlier code: 1=>3σ outlier,
and omitted from the fit.
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History:
From electronic version of the journal
References:
Muterspaugh et al., Paper I 2010AJ....140.1579M 2010AJ....140.1579M, Cat. J/AJ/140/1579
Muterspaugh et al., Paper III 2010AJ....140.1631M 2010AJ....140.1631M
Muterspaugh et al., Paper IV 2010AJ....140.1646M 2010AJ....140.1646M
Muterspaugh et al., Paper V 2010AJ....140.1657M 2010AJ....140.1657M, Cat. J/AJ/140/1657
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Jul-2012