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J/AJ/111/936      ICCD Speckle obs. of binary stars. XIII (Hartkopf+ 1996)
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ICCD Speckle observations of binary stars.
XIII. Measurements during 1989-1994 from the Cerro Tololo 4 m telescope
     Hartkopf W.I., Mason B.D., McAlister H.A., Turner N.H., Barry D.J.,
     Franz O.G., Prieto C.M.
    <Astron. J. 111, 936 (1996)>
    =1996AJ....111..936H
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ADC_Keywords: Stars, double and multiple ; Interferometry

Abstract:
    Nine hundred eighty-nine observations of 694 binary star systems,
    observed by means of speckle interferometry with the 4m telescope on
    Cerro Tololo, are presented. Included in these observations are three
    new interferometric binaries and new interferometric companions to
    four visual binaries. These measurements, made during the period
    1989-1994, comprise the 13th installment of digital results stemming
    from our speckle program at several major observatories, and the 23rd
    list since the program's inception in 1975.

File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
table1.dat      83          7   New interferometric components
table2.dat      73        987   Binary star speckle measurements
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See also:
    I/107 : Washington Double Star Catalog (WDS) (Worley+ 1984)
    J/AJ/106/352  : ICCD speckle obs. of binary stars. VIII (Hartkopf+ 1993)
    J/AJ/106/637  : ICCD speckle obs. of binary stars. IX (Mason+, 1993)
    J/AJ/106/1639 : ICCD speckle obs. of binary stars. X (McAlister+ 1993)
    J/AJ/108/2299 : ICCD speckle obs. of binary stars. XI (Hartkopf+ 1994)
    J/AJ/111/393  : ICCD speckle obs. of binary stars. XII (Al-Shukri+ 1996)
    ftp://ftp.chara.gsu.edu/ : results from CHARA project

Byte-by-byte Description of file: table1.dat
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   Bytes  Format  Units   Label      Explanations
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   1- 10   A10    ---     NameJ      Epoch 2000 RA & Dec in manner of WDS
  13- 24   A12    ---     DM         Durchmusterung (BD, CD, or CP) number
  26- 31   I6     ---     HD         Henry Draper number
  34- 39   A6     ---     CHARA      Binary star discoverer (CHARA) designation
  42- 44   F3.1   mag     Vmag       Combined V magnitude
  47- 49   F3.1   mag     dVmag      V magnitude difference
  52- 60   A9     ---     Sp         Spectral type
  62- 70   F9.4   yr      Epoch      Discovery date, as fractional Besselian yr
  73- 77   F5.3   arcsec  Sep        Binary star separation, at discovery
  80- 83   I4     yr      Period    *Estimated orbital period
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Note on Period:
  Estimated orbital period, assuming circular, face-on orbits
  with both components of equal brightness and mass
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Byte-by-byte Description of file: table2.dat
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   Bytes  Format  Units   Label      Explanations
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   1- 10   A10    ---     WDS       *WDS number <I/107>, equinox 2000.0
  13- 24   A12    ---     Disc       Discoverer designation
  27- 34   A8     ---     HD/DM     *Henry Draper or Durchmusterung number
  38- 44   F7.4   yr      Date       Observation date (-1900)
  48- 52   F5.1   deg     Theta     *Position angle
      53   A1     ---   u_Theta      Uncertainty flag for Theta
  57- 61   F5.3   arcsec  Rho       *Angular separation
      62   A1     ---   u_Rho        Uncertainty flag for Rho
  66- 73   A8     nm      Lambda     Filter effective wavelength and FWHM
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Note on WDS:
  The coordinates, which serve as the Washington Double Star Catalog
  (WDS) number, are for equinox 2000.0, but position angles have not
  been corrected for precession and are thus based upon the equinox
  for the epoch of observation (field Date).
Note on HD/DM:
  DM designations are BD numbers for declinations north of -21 deg,
  CPD numbers for stars further south.
Note on Theta, Rho:
  Accuracies are a function of stellar magnitude, magnitude
  difference, separation, and observing conditions; typical values for
  these observations are 1-3 mas in Rho and 0.1-0.2 deg in Theta.
  Colons following Theta or Rho values indicate measurements of
  somewhat reduced accuracy, usually the result of observing fainter
  systems or systems of larger magnitude difference.
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Origin: AAS CD-ROM series, Volume 6, 1996         Lee Brotzman [ADS] 10-Mar-1996
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(End)                                                         [CDS]  05-Sep-1996