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III/170           IRAS Point Source Identifications (MacConnell, 1993)
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IRAS Point Sources of flux at 12 microns greater than flux at 25 microns and
falling within about 7 degrees of the Galactic Plane
   MacConnell D.J.
   <(unpublished, 1993)>
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ADC_Keywords: Infrared sources; Stars, late-type

Abstract:
    The file is an ASCII text file containing the classifications of 14,192
    IRAS Point Sources with the flux at 12 microns greater than the flux at 25
    microns and falling within about 7 deg of the galactic plane. The aim has
    been to provide classifications of IRAS PS with no previous associations,
    so most bright stars such as in the BSC, SAO, and HD which have
    associations and good spectral types are not included. Also, many known
    carbon stars from the catalogue of Stephenson known to be associated with
    PS are not included.

Introduction:
    Most of the sources are south of the celestial equator and have been
    classified in increasing galactic longitude over the period Sept. 1985 to
    May 1992. They have been classified on Kodak I-N objective-prism plates
    taken primarily with the Curtis Schmidt telescope at Cerro Tololo, but
    some northern plates taken with the Burrell Schmidt at Kitt Peak were also
    used for classification. The spectra cover the range 6800-8800 A at a
    dispersion of 3400 A/mm at the A-band, and the plate scale is 96.6 "/mm.
    They are ideal for classifying M stars of type M3 and cooler (increasing
    strength of TiO and VO bands) and carbon stars (CN bands), but stars warmer
    than M2 and most S stars cannot be classified or identified as such. The M
    stars M3 and cooler can be separated into about five groups. The limiting
    mag of the deepest plates is I about 13.5.

    The IRAS PS were identified on transparent overlays made to the plate scale
    for each plate center, and the association of a spectrum with a given PS is
    usually unambiguous. In cases of doubt or offset, a comment is made. Note
    that there are some cases where the PSC gives an incorrect association on
    the basis of position, and the correct association is with a faint,
    uncatalogued M star.

File Summary:
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 FileName      Lrecl    Records       Explanations
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ReadMe            80          .       This file
ps_id.dat         69      14192       The catalog of identifications
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Byte-by-byte Description of file: ps_id.dat
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   Bytes   Format      Units    Label    Explanations
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   1- 10    A10        ---      name     +IRAS Name (Increasing Right
                                                     Ascension (1950))
  11- 35    A25        ---      class    Classification
  36- 41    A6         arcsec   off      [NSEW ".0-9]Offset from IRAS position
  42- 46    I5         ---      Npl      Plate number (1)
  47- 48    A2         ---      NplS     Plate number supplement
  49- 50    A2         ---      den      Density on scale of 0 to 20
  51- 69    A19        ---      id       Identifications / remarks (2)
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Note (1): l = 60m exposure, sensitized plate
          m = 30m exposure
          s = 5m exposure
Note (2): Not all variable stars, carbon stars, etc. have been identified
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   This work has been supported by the NASA ADP during several cycles, and
   further funding will be sought to continue classifying beyond the current
   cut-off in gal. longitude of 314 deg. If there are comments/corrections/
   questions, please contact:
                  D. Jack MacConnell      macconnell@stsci.edu
                  CSC/STScI               Tel.: 410-338-4800
                  3700 San Martin Drive   FAX:  410-338-4767
                  Baltimore, MD  21218
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(End)       Nancy G. Roman [NASA/NSSDC/ADC] and D. Jack MacConnell   02-May-1994