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J/A+A/352/228       Transitional YSOs candidates             (Magnier+, 1999)
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Transitional YSOs: candidates from flat-spectrum IRAS sources
       Magnier E.A., Volp A.W., Laan K., Van den Ancker M.E., Waters L.B.F.M.
      <Astron. Astrophys. 352, 228 (1999)>
      =1999A&A...352..228M
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ADC_Keywords: YSOs ; Infrared sources
Keywords: stars: circumstellar matter - stars: evolution - stars: formation -
          stars: mass-loss - stars: pre-main sequence

Abstract:
    We are searching for Young Stellar Objects (YSOs) near the boundary
    between protostars and pre-main-sequence objects, what we term
    Transitional YSOs. We have identified a sample of 125 objects as
    candidate transitional YSOs on the basis of IRAS colors and the
    optical appearance on POSS plates. We have obtained optical and
    near-IR imaging of 82 objects accessible from the Northern Hemisphere
    and optical images of 62 sources accessible from the South. We also
    created deconvolved 60{mu}m IRAS images of all sources. We have
    classified the objects on the basis of their morphology in the optical
    and near-IR images. We find that the majority of our objects are
    associated with star-forming regions, confirming our expectation that
    the bulk of these objects are YSOs. Of the 125 objects, 28 have a
    variety of characteristics very similar to other transitional YSOs,
    while another 22 show some of these characteristics. Furthermore we
    have found seven objects to be good candidates for members of the
    Herbig Ae/Be stellar group, of which three are newly identified as
    such.

File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations
--------------------------------------------------------------------------------
ReadMe          80          .    This file
table1.dat     117        125    Transitional YSO candidate IRAS sources
table1.tex     236        179    LaTeX version of table1
table1.ps       72        871    PostScript version of table1
south/*          .         62   *Poscript Figures for Southern observations
north/*          .         83   *Poscript Figures for Northern observations
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Note on north/* and south/*: Northern and Southern observations have been
     performed by two individual teams, and 23 sources have a figure
     in the two subdirectories.
     3 objects, IRAS 10075-6647, IRAS 10292-4148 and IRAS 19111+0212
     have no figures.
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See also:
           II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
    J/ApJ/397/520 : IRAS obs. of YSO in Corona Australis (Wilking+, 1992)

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label   Explanations
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   1- 10  A10   ---     IRAS    IRAS designation (NNNNN+NNNN)
  12- 13  I2    h       RAh     Right ascension (J2000)
  15- 16  I2    min     RAm     Right ascension (J2000)
  18- 21  F4.1  s       RAs     Right ascension (J2000)
      23  A1    ---     DE-     Declination sign (J2000)
  24- 25  I2    deg     DEd     Declination (J2000)
  27- 28  I2    arcmin  DEm     Declination (J2000)
  30- 31  I2    arcsec  DEs     Declination (J2000)
      33  I1    ---     ID      [1/7] Category (1)
  35- 45  A11   ---   southFile Name of postscript file, in "south" subdirectory
      46  A1    ---     Missing [*] files not present
  47- 53  A7    ---   northFile Name of postscript file, in "north" subdirectory
  55-117  A63   ---     Note    Notes
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Note (1): The category number takes the following values:
       1: A likely transitional YSO: A single moderately-bright, very-red
           stellar object with extensive associated reflection nebulosity.
           (28 objects)
       2: A possible transitional YSO: a moderately red stellar object with
           weak nebulosity or a significantly red object with no nebulosity.
           (22 objects)
       3: A YSO group: Several very red objects, usually with extended
           nebulosity. No single object stands out. (21 objects)
       4: Bright star. (7 objects)
       5: A cluster of stars: usually a red cluster with no single very red
           star. (18 objects)
       6: A galaxy. (11 objects)
       7: nothing: no object stands out, and no object can be associated with
           any of the other classes. (18 objects)
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Acknowledgements: Arjan Volp <volp@astro.uva.nl>
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(End)                                          Patricia Bauer [CDS]  28-Jan-2000