II/235 The Photometric Magnitude Difference Catalog (Worley+ 2001)
The 2001 US Naval Observatory Double Star CD-ROM. IV. The Photometric
Magnitude Difference Catalog
Worley C.E., Mason B.D., Wycoff G.L.
<Astron. J. 122, 3482 (2001)>
=2001AJ....122.3482W 2001AJ....122.3482W
ADC_Keywords: Stars, double and multiple ; Photometry
Keywords: Stars: Binaries: General, Stars: Binaries: Visual, Catalogs
Description:
The Photometric Magnitude Difference Catalog is a collection of all double
star photometric data which does not contain astrometric information and is
therefore inappropriate for the Washington Double Star Catalog. Magnitude
difference information can be useful in estimating mass ratios, determining
photocentric positions which are color dependent, or into investigations of
variability in close binary systems. Due to uncertainties in bandpass
characteristics or variability, no summary line is presented, rather a
complete listing of all data.
Introduction:
The Photometric Magnitude Difference Catalog (hereafter Delta-M Catalog) was
initiated as an internal USNO publication by C.E. Worley and remained as an
internal publication for over 20 years. While private copies circulated, this
is the first open presentation of these accumulated data. No ``WDS-like''
summary line is provided, rather, a complete listing of all photometric data
is given. When available, bandpass characteristics and errors are provided,
as are other notes (for example, systems not in the WDS are indicated).
A more detailed introduction is provided in the "dm.txt" file.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
deltam.dat 86 19589 Delta-M Catalog
dm.txt 76 177 Delta-M Catalog Documentation
table1.txt 76 23 ascii version of Table 1
method.txt 78 26 method key for deltam.dat
refs.dat 338 4195 Reference file
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See also:
http://ad.usno.navy.mil/wds/dmtext.html : Delta-M Catalog
maintained at the U.S. Naval Observatory
Byte-by-byte Description of file: deltam.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh *Right Ascension J2000 (hours)
3- 5 I3 0.1min RAdm *Right Ascension J2000 (minutes)
6 A1 --- DE- *Declination J2000 (sign)
7- 8 I2 deg DEd *Declination J2000 (degrees)
9- 10 I2 arcmin DEm *Declination J2000 (minutes)
12- 18 A7 --- DiscName *Discoverer Code & Number
19- 23 A5 --- Comp *Component Identification
24- 28 F5.2 mag dm Magnitude Difference
31- 32 I2 --- o_dm ?Number of observations used to
compute dm
34- 41 A8 --- r_dm *Reference Code
43 A1 --- Meth *Observational Method
44- 86 A43 --- Notes *?Notes
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Note on RAh, RAdm, DE-, DEd, DEm:
The positions given represent our best estimates of these values. Where
possible, these are based on the WDS data, with proper motion incorporated.
Note on DiscName:
The discoverer, identified by a one-to-three letter code, and the
discoverer's number, if assigned. The reference list ("refs.dat")
should be consulted first to identify individuals.
Note on Comp:
Components, when the object has more than two. The WDS 2001 scheme is
maintained.
Note on r_dm:
The NewCode from refs.dat file. The first three letters corresponds to the
WDS discoverer while the next four numbers indicate the date of publication.
Note on Meth:
The various methods are detailed below, and in "method.txt" file;
statistics on the different methods can be found in file "table1.txt".
There are a plethora of interferometric techniques which are distinguished
due to the familiarity of the authors with same. For specifics, consult
the appropriate reference cited in the references.
A = Adaptive Optics.
B = Long-baseline interferometer visibility amplitude fitting.
C = Visual measures with a double-image micrometer.
D = speckle interferometric comparison of DVA peak heights of stars with
known delta-m and approximately the same brightness.
E = speckle interferometric visibility curve-fitting.
F = speckle interferometric fork.
G = Visual estimate made with an objective grating.
H = Wickes and Dicke interferometer - rotating prism and high-frequency
chopping wheel.
I = Integrated image taken with speckle camera. No autocorrelation is
done, and the scaled peak heights are compared.
J = CCD.
K = Focal-grating photometer.
L = speckle interferometric relative intensity of autocorrelation.
M = IR speckle interferometric shift-and-add.
N = Photocell with diaphragm in focal plane.
O = Lunar Occultation.
P = Photographic plates.
Q = Tycho photometry of Hipparcos Stars
R = Area scanner.
S = speckle interferometric modified shift-and-add.
T = speckle interferometric triple correlation or bispectrum.
V = Photoelectric photometry.
W = Wedge photometer.
Z = Visual photometry with a double-image or polarizing photometer.
Note on Notes:
This may contain specifics of the filter used (both effective wavelength and
FWHM in nanometers), errors (i.e., ``SIGMA = ''), colors, and indications of
uncertainty, variability when a component is not in the WDS, or when a
reference is to an additional publication.
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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 --- NewCode *New reference code used in Orbit,
Speckle and Delta-M Catalogs
11- 13 A3 --- OldCode Discoverer Code
14- 15 I2 --- RefNo *?Reference number of publication
18- 54 A37 --- Obs Observer(s)
55-338 A284 --- Publ Publication reference for measures
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Note on NewCode:
The first three letters corresponds to the WDS discoverer while the next four
numbers indicate the date of publication. New Code = XYZ1999x
Note on RefNo:
99 = Unpublished, manuscript or reference not found.
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References:
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"Second catalogue d'orbites d'Etoiles Doubles visuelles", Baize, P. 1950,
Journal des Observateurs, 33, 1 =1950JO.....33....1B 1950JO.....33....1B
"Differential Binary Star Photometry Using the Adaptive Optics System at
Starfire Optical Range", Brummelaar, T. A. Ten, Mason, B. D., Bagnuolo,
W. G., Jr., Hartkopf, W. I., McAlister, H. A., and Turner, N. H. 1996,
AJ, 112, 1180 =1996AJ....112.1180B 1996AJ....112.1180B
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McAlister, Harold A., Roberts, Lewis C., Jr., Turner, Nils H., Hartkopf,
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=2000AJ....119.2403T 2000AJ....119.2403T
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multiple stars", Fabricius, C. and Makarov, V. V. 2000, A&A, 356, 141
=2000A&A...356..141F 2000A&A...356..141F
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double stars", Franz, O. G. 1970, Lowell Observatory Bulletin, 7, 191
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=1996AJ....112.2260M 1996AJ....112.2260M
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(End) B.D. Mason [U.S. Naval Observatory] 12-Jul-2002