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J/ApJS/49/27   Faint blue objects at high galactic latitude. III. (Usher 1982)
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Faint blue objects at high galactic latitude. III. Palomar Schmidt field
centered on Selected Area 28
         Usher P.D., Mitchell K.J.
         <Astrophys. J. Suppl. Ser. 49, 27 (1982)>
         =1982ApJS...49...27U
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Keywords: quasars - stars: faint blue - stars: white dwarfs

Abstract:
    The third part of the list of ultraviolet excess objects is comprised
    of 1179 objects selected from a Palomar Schmidt three-color plate
    centered on Kapteyn Selected Area 28. The population belonging to
    color classes 1A, 1 and 1B should consist primarily of quasars and
    dwarfs and should be statistically complete to at least B = 18.5 mag.


File Summary:
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FileName     Lrecl    Records    Explanations
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ReadMe          80          .    This file
table1          43       1179    Faint Blue Objects in Palomar Schmidt
                                     Field centered on SA 28
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Byte-by-byte Description of file: table1
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   Bytes Format  Units   Label    Explanations
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   2-  5  I4     ---     US       Running number (US catalogue)
   8- 10  A3     ---     CC       Color class (1); it may include
                                   an uncertaintly flag [:] in byte 10.
  12- 15  F4.1   mag     B        Blue magnitude
      16  A1     ---     u_B      [:] uncertainty flag on B
  18- 19  I2     h       RAh      Right Ascension 1950 (hours)
  21- 22  I2     min     RAm      Right Ascension 1950 (minutes)
  24- 27  F4.1   s       RAs      Right Ascension 1950 (seconds)
      29  A1     -       DE-      Declination 1950 (sign)
  30- 31  I2     deg     DEd      Declination 1950 (degrees)
  33- 34  I2     arcmin  DEm      Declination 1950 (minutes)
  36- 37  I2     arcsec  DEs      Declination 1950 (seconds) (2)
  39- 43  A5     ---     Notes    [CGRE?,] Comments. Abbreviations used:
                                  CG = Compact Galaxy
                                  C  = confused sources
                                  ?  = uncertainty
                                  E  = edge zone
                                  R  = further remarks (see paper)
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Note (1): Color classes are defined in Usher (1981) as:
     1A : (U-V)<0, above the blackbody line by D(U-B) ~ 0.15mag,
              mainly populated by quasars
     1  : (U-V)<0, within +/- 0.15mag in D(U-B) of blackbody line
     1B : (U-V)<0, below the blackbody line by D(U-B) ~ 0.15mag,
              in the general vicinity of the white dwarf cooling curve
     1BS: close to luminosity class III-V line for blue halo stars
     1C : (U-V)>=0, above blackbody line, where N and lineless spectrum
              galaxies are often located
     2  : (U-V)>=0, below blackbody line
     3  : within the region of subdwarfs and halo HB stars.

Note (2): values of 60 have been transformed

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References:
    Usher P.D.: 1981, ApJ. Suppl. 46, 117
    Usher P.D., Mattson D., Warnock A.: 1982,  ApJ. Suppl. 48, 51
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(End)                  M.J. Wagner,      Francois Ochsenbein [CDS]   24-Jul-1993