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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
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
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.
References: "Binary star speckle photometry. I - The colors and spectral types of the Capella stars", Bagnuolo, William G., Jr. and Sowell, James R. 1988, AJ, 96, 1056 =1988AJ.....96.1056B "Second catalogue d'orbites d'Etoiles Doubles visuelles", Baize, P. 1950, Journal des Observateurs, 33, 1 =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 "Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory", ten Brummelaar, Theo, Mason, Brian D., McAlister, Harold A., Roberts, Lewis C., Jr., Turner, Nils H., Hartkopf, William I., and Bagnuolo, William G., Jr. 2000, AJ, 119, 2403 =2000AJ....119.2403T "The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission", Perryman, M. A. C. and ESA 1997, The Hipparcos and Tycho catalogues. Astrometric and photometric star catalogues derived from the ESA Hipparcos Space Astrometry Mission, Publisher: Noordwijk, Netherlands: ESA Publications Division, 1997, Series: ESA SP Series vol no: 1200, ISBN: 9290923997 (set)=1997hity.book.....P "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Fabricius, C. and Makarov, V. V. 2000, A&A, 356, 141 =2000A&A...356..141F "A photoelectric area scanner for astrometry and photometry of visual double stars", Franz, O. G. 1970, Lowell Observatory Bulletin, 7, 191 =1970LowOB...7..191F "Relative photographic positions and magnitude difference of the components of Sirius.", Lindenblad, I. W. 1970, AJ, 75, 841 =1970AJ.....75..841L "ICCD Speckle Observations of Binary Stars.XV.An Investigation of Lunar Occultation Systems", Mason, Brian D. 1996, AJ, 112, 2260 =1996AJ....112.2260M "Binary Star Orbits from Speckle Interferometry. XI. Orbits of Twelve Lunar Occultation Systems.", Mason, Brian D. 1997, AJ, 114, 808 =1997AJ....114..808M "CD speckle observations of binary stars. VII - A duplicity survey of the Hyades cluster", Mason, Brian D., McAlister, Harold A., Hartkopf, William I., and Bagnuolo, William G., Jr. 1993, AJ, 105, 220 =1993AJ....105..220M "Photometric Observations. Part I. Chapter IV. Bright Double Stars", Pickering, Edward C., Searle, Arthur, and Upton, Winslow 1879, Annals of Harvard College Observatory, 11, 105 =1879AnHar..11..105P "Three Methods of Determining Magnitudes of Individual Stars in Resolved Binary Systems", Roberts, Lewis C., Jr. 1999, PASP, 111, 650 =1999PASP..111..650R Strand, K.A. 1969, Pub. USNO 18, Pt. 5 "CCD observations of visual binary stars.", Tokovinin, A. A. and Shatskii, N. I. 1995, Pis ma Astronomicheskii Zhurnal, 21, 523 =1995PAZh...21..523T "Photometric determinations of magnitude differences for visual binaries.", Worley, C. E. 1969, AJ, 74, 764 =1969AJ.....74..764W
(End) B.D. Mason [U.S. Naval Observatory] 12-Jul-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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