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III/10A    G5 and Later Stars in a North Galactic Pole Region    (Upgren 1962)
G5 and Later Stars in a North Galactic Pole Region
     Upgren Jr. A.R.
    <Astron. J. 67, 37 (1962)>
    =1962AJ.....67...37U
ADC_Keywords: Galactic pole, north ; Stars, late-type ; 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 in Upgren (1984), 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) 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).

    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:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
catalog.dat       45     4027   Catalog data
notes.dat         80      142   Notes for this catalog


Byte-by-byte Description of file: catalog.dat

   Bytes Format Units  Label     Explanations

   1-  6  A6    ---    NGP      *NGP designation
   8- 15  A8    ---    DM        DM number (all BD) of the star
  17- 22  I6    ---    HD        ? HD number
  25- 28  F4.1  mag    Bmag      ? Blue magnitude
  30- 36  A7    ---    Sp        Spectral type (colons for uncertainty)
      43  A1    ---    Reg       Subregion and identification chart
      45  A1    ---    Note      [*] Note flag (asterisk)

Note on NGP:
     the NGP designation is made of a zone number (bytes 1-2) and a
     sequential number in the zone (bytes 4-6).


Byte-by-byte Description of file: notes.dat

   Bytes Format Units  Label     Explanations

   1-  6  A6    ---    NGP       NGP designation
       8  I1    ---    No        Line number within a note
   9- 80  A72   ---    Text      Text of remarks


History:
    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:
  Slettebak A., Stock J., 1959, "A Finding List of Stars of Spectral
    Type F2 and Earlier in a North Galactic Pole Region",
    Astron. Abh. Hamburg. Sternw., 5, 105  (=1959AAHam...5..105S)
  Upgren, A.R. 1960,  Astron. J., 65, 644 (=1960AJ.....65..644U)
  Upgren, A.R. 1984, Contr. Van Vleck Obs. No. 2, p. 19 for finder charts.
(End)                       C.-H. Joseph Lyu [Hughes STX/NASA]       10-Jun-1995