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III/10A    G5 and Later Stars in a North Galactic Pole Region      (Upgren 1962)
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G5 and Later Stars in a North Galactic Pole Region
    Upgren Jr. A.R.
   <Astron. J. 67, 37 (1962)>
   =1962AJ.....67...37U
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ADC_Keywords: Galactic pole, north; Regional catalog

Description:
   The catalog is an objective-prism survey of late-type stars in a
   region of 396 square degrees surrounding the north galactic pole. 
   The objective-prism spectra employed have a dispersion of 580 A/mm
   at H-gamma and extend into the ultraviolet region.  The catalog
   contains the magnitudes and spectral classes of 4027 stars of class
   G5 and later, complete to a limiting photographic magnitude of 13.0.
   The spectral classification of the stars is based on the Yerkes
   system.  The catalog includes the serial numbers of the stars
   corresponding to the numbers on the identification charts, BD and HD
   numbers, B magnitudes, spectral classes, and letters designating the
   subregion and identification chart on which each star is located. 
   This survey was undertaken to determine the space densities at varying    
   distances from the galactic plane.  Accurate separation of the            
   surveyed stars of G5 and later into giants and dwarfs was achieved        
   through the use of the uv region as well as conventional methods of       
   classification.  The resulting catalog of 4027 stars is probably          
   complete over the region to a limiting photographic magnitude of          
   13.0.  The region covered by the survey is the same as that discussed     
   by Slettebak and Stock (1959, A Finding List of Stars of Spectral         
   Type F2 and Earlier in a North Galactic Pole Region, Hamburger            
   Sternwarte) and is in the approximate range RA 11 30 to 13,               
   Declination +25 to +50 (B1950.0).  The catalog includes all M and         
   Carbon stars previously published by Upgren (1960, Astron. J. 65,         
   644).  For a discussion of the classification criteria, the combining     
   of multiple classifications (each spectral image was classified           
   twice), the determination of magnitudes, and additional details           
   about the catalog, the source reference should be consulted.              

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
catalog.dat     45       4027    Catalog data
notes.dat       80        142    Notes for this catalog
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Byte-by-byte Description of file: catalog.dat
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   Bytes  Format  Units  Label     Explanations
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   1-  2   I2     ---    zone      Zone designation        
   3-  6   I4     ---    Starnum   Star number (sequential)
   8- 10   I3     ---    DM_z      ?BD zone 
  11- 15   I5     ---    DM_n      ?BD number 
  17- 22   I6     ---    HD        ? HD number               
  25- 28   F4.1   mag    Mag       ? Magnitude               
  30- 36   A7     ---    Sp        Spectral type (colons for uncertainty) 
      43   A1     ---    Region    Region                  
      45   A1     ---    flag      Note flag (asterisk)    
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Byte-by-byte Description of file: notes.dat
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   Bytes  Format  Units  Label     Explanations
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   1-  2   I2     ---    Cat1      Catalog number part I
   3-  6   I4     ---    Cat2      Catalog number part II
   8- 81   A74    ---    rem       Remarks
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Remarks:
  The catalog, as originally received by the Centre de Donnees Astronomiques
  de Strasbourg, was essentially in the form of the published table, but with
  a brief data description (by columns) in free text at the top of the file. 
  However, some kind of strange pseudo-coordinates had been added to the
  records.  Right ascensions for each region started at some value and
  increased by 0.01 hours for each succeeding star.  From each right ascension
  and the declination zone (only), galactic coordinates had been computed. The
  right ascensions then restarted for each new region.  The source of these
  coordinates is unknown, as they were not in the original catalog; Dr. Upgren
  did not computerize the machine version and had no knowledge of their
  existence.  These coordinates were removed at the ADC.  A comparison of the
  machine-readable file against the published catalog also revealed a number
  of errors, such as duplicate and missing records.  A number of errors had
  also been discovered by Dr. S. Nishimura of the Japanese Astronomical Data
  Center, National Astronomical Observatory, Tokyo.  The errors have been
  corrected in the present file.  The notes to the catalog were computerized
  at the ADC and are flagged by asterisks in the main file. 

References:
  Upgren A. R. 1984, Contr. Van Vleck Obs. No. 2, p. 19 for finder charts.
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(End)                       C.-H. Joseph Lyu [Hughes STX/NASA]       10-Jun-1995