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III/12A     F5 and Later Stars in SA28, 54, 106, 107     (Upgren, Staron 1970)
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F5 and Later Stars in Selected Areas 28, 54, 106, 107                   
  Upgren Jr. A.R., Staron R.T. 
  <Astrophys. J. Suppl. 19, 367 (1970)>
  =1970ApJS...19..367U
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ADC_Keywords: Selected areas

Description:
  The catalog is an objective-prism survey of 2181 stars later than
  spectral class F2; the earlier stars are in catalog ADC# 3011A.  The
  limiting magnitude is about 11.5.  Four regions of intermediate
  galactic latitude are included in this survey.  Each region is
  centered on one of the Selected Areas 28, 54, 106, and 107 and
  consists of a square 7 degrees on a side or about 50 square degrees
  in area.  The fields, 4 x 4 degrees in size, were each photographed
  on two IIa-O emulsion plates, one with an exposure time of three
  minutes on which bright stars could be classified and one with an
  exposure time of 40 minutes extending to faint stars.  The plates
  were taken with the 24-inch Baker-Schmidt telescope of the Dyer
  Observatory.  The dispersion of the objective prism is about 330
  A/mm at H-gamma.  The stars were classified according to the
  criteria established by Nassau and Seyfert (1946) and Nassau and van
  Albada (1947). Photographic magnitudes were found from direct IIa-O
  plates taken with the 8-inch Ross camera of the Yale University
  Observatory. The catalog includes BD numbers, magnitudes, and
  spectral classes for BD stars.  For non BD stars, the BD number
  listed in bytes 1-3 indicates a nearby BD star from which the star
  listed is offset by the values in bytes 5-12 and 15-17 given in
  minutes of arc. 

File Summary:
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 FileName    Lrecl    Records    Explanations
--------------------------------------------------------------------------------
ReadMe          80          .    This file
bdstars.dat     27       1627    catalog data for BD stars
nonbd.dat       37        503    data for non-BD stars
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Byte-by-byte Description of file: bdstars.dat
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   Bytes  Format Units  Label      Explanations
--------------------------------------------------------------------------------
   1-  3   I3    ---    AreaNum    Selected Area number 
   5- 12   A8    ---    BD         BD number            
  15- 18   F4.1  mag    PhotoMag   Photographic magnitude
      19   A1    ---    u_PhotoMag Colon for uncertainty in photographic 
                                   magnitude   
  21- 22   A2    ---    SpTemp     Spectral type, temperature class and subclass 
      23   A1    ---    u_SpTemp   Colon for uncertainty in temperature 
                                   class/subclass
  24- 26   A3    ---    LumCl      luminosity class
      27   A1    ---    u_LumCl    Colon for uncertainty in luminosity class
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Byte-by-byte Description of file: nonbd.dat
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   Bytes  Format  Units  Label      Explanations
--------------------------------------------------------------------------------
   1-  3   I3     ---    AreaNum    Selected Area number
   5- 12   A8     ---    BD         BD number of nearby star
  15- 17   A3     arcmin RAoffset   Right ascension offset from BD star given in
                                    bytes 5-12, minutes of arc
  20- 22   A3     arcmin DEoffset   Declination offset from BD star given in       
                                    bytes 5-12, minutes of arc 
  25- 28   F4.1   mag    PhotoMag   Photographic magnitude 
      29   A1     ---    u_PhotoMag Colon for uncertainty in photographic 
                                    magnitude   
  31- 32   A2     ---    SpTemp     Spectral type, temperature class and subclass 
      33   A1     ---    u_SpTemp   Colon for uncertainty in temperature 
                                    class/subclass
  34- 36   A3     ---    LumCl      luminosity class
      37   A1     ---    u_LumCl    Colon for uncertainty in luminosity class
--------------------------------------------------------------------------------

Remarks:
  This survey is part of a study of stellar densities with a view
  toward determining the inclination to the galactic plane of
  surfaces of equal stellar density. 
  Data format modified at the Astronomical Data Center (ADC)/NASA GSFC,   
  1988 June...WHW                                                         

Reference(s):
  Nassau, J.J., and Seyfert, C.K. 1946, ApJ, 103, 117
  Nassau, J.J., and van Albada, G.B. 1947, ApJ, 106, 20
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(End)                       C.-H. Joseph Lyu [Hughes STX/NASA]      10-Jun-1995