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J/AJ/107/2120       JHK photometry of the OMC2 region (Jones+ 1994)
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A near infrared survey of the OMC2 region
       Jones T.J., Mergen J., Odewahn S., Gehrz R.D., Gatley I., Merrill K.M.,
       Probst R., Woodward C.E.
      <Astron. J. 107, 2120 (1994)>
      =1994AJ....107.2120J      (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, infrared

Abstract:
    We present an unbiased survey at 1.25-2.2um of a 0.025sq.deg. region
    surrounding the core of Orion Molecular Cloud 2 (OMC-2). Analysis of
    the source counts and colors indicates that the majority of the
    sources brighter than K=+13 are not field stars. They must be members
    of a young association or associations within the survey area. The K
    band luminosity function (corrected for field star contamination using
    model calculations) exhibits a drop in counts at magnitudes fainter
    than K=+13 (~0.15L_{sun}_). This is most easily explained by assuming
    that the association(s) are young. The lowest mass stars simply have
    not yet reached the main sequence. The distribution of colors across
    the region shows moderate correlation with molecular gas, but both
    reddened and unreddened stars are present along most lines of sight.
    Considerable reflection nebulosity is present in the region of the
    core cluster of OMC2 itself. Of particular interest are the thin
    streamers emanating from the star J9, which may be the remnant of a
    bipolar nebula produced by the star in the recent past.

Objects:
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       RA  (2000)  DE    Designation(s)
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    05 35 27   -05 10.1  OMC 2 = GAL 208-19.2
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File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             55      219   Source list
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Byte-by-byte Description of file: table1
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   Bytes Format Units    Label     Explanations
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   1-  3  I3    ---      ID        Identitication number
       5  I1    h        RAh       Right ascension (1950)
   7-  8  I2    min      RAm       Right ascension (1950)
  10- 13  F4.1  s        RAs       Right ascension (1950)
      15  A1    ---      DE-       Declination sign
      16  I1    deg      DEd       Declination (1950)
  18- 19  I2    arcmin   DEm       Declination (1950)
  21- 22  I2    arcsec   DEs       Declination (1950)
  24- 28  F5.2  mag      Jmag      ? J magnitude (1.20 {mu}m)
  30- 33  F4.2  mag    e_Jmag      ? rms uncertainty on Jmag
  35- 39  F5.2  mag      Hmag      ? H magnitude (1.62 {mu}m)
  41- 44  F4.2  mag    e_Hmag      ? rms uncertainty on Hmag
  46- 50  F5.2  mag      Kmag      ? K magnitude (2.20 {mu}m)
  52- 55  F4.2  mag    e_Kmag      ? rms uncertainty on Kmag
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History: Prepared via OCR at CDS.
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(End)                           James Marcout, Patricia Bauer [CDS]  07-Mar-1997