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J/A+A/316/102        JHK Photometry in NGC 6334 (Tapia+, 1996)
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The embedded stellar population in northern NGC 6334
      Tapia M., Persi P., Roth M.
     <Astron. Astrophys. 316, 102 (1996)>
     =1996A&A...316..102T      (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, infrared
Keywords: infrared: stars - stars: formation - clusters: NGC 6334 cluster -
          ISM: NGC 6334

Abstract:
    JHK imaging photometry is reported of an area of approximately 2'x3'
    centred on the far infrared source NGC 6334 I with limiting magnitudes
    J=18.3, H=17.8 and K=16.2. More than 224 sources were detected in
    K-band, increasing by a factor of more than seven the number of
    objects found in previous near-IR surveys. Most of the sources are
    located in an area of about 3500 square arcsec centered around the
    massive young stellar object Irs1, which ionizes the compact HII
    region NGC 6334 F. The location of these sources and the analysis of
    the colour-colour and colour-magnitude diagrams suggest the presence
    of an embedded and young stellar cluster of size ~70" (0.6pc), and
    stellar density of about 1200pc^-3^. The star formation efficiency is
    estimated to be SFE=~0.25. Only a few of the most luminous stars of
    the cluster were found to show large near-IR excesses but this may be
    due to the non-detection, at the shortest wavelength, of the majority
    of the highly reddened cluster members. The extinction of the region
    is very variable with a maximum of A_V_>70 in Irs2 while the average
    is <A_V_>=~40. Very close to the position of an H_2_O maser associated
    with NGC 6334 I(N), a contracting core at an earlier evolutionary
    stage, we found six very red sources, one of which is a small and
    diffuse nebula seen only at 2.2{mu}m. Finally, the older and developed
    HII region NGC 6334 E was found to be probably ionized by a small
    cluster of at least 12 B0-B0.5 ZAMS stars.
    For a description of the JHK photometric system, see e.g.  <GCPD/09>

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             62      224   Coordinates and photometry of sources
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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    ---     No        [1/224] Identification number
   5-  6  I2    h       RAh       Right ascension (B1950)
   8-  9  I2    min     RAm       Right ascension (B1950)
  11- 15  F5.2  s       RAs       Right Ascension (B1950)
      17  A1    ---     DE-       Declination sign
  18- 19  I2    deg     DEd       Declination (B1950)
  21- 22  I2    arcmin  DEm       Declination (B1950)
  24- 27  F4.1  arcsec  DEs       Declination (B1950)
      29  A1    ---   l_Jmag      Limit flag on J magnitude
  30- 34  F5.2  mag     Jmag      ? J magnitude
      36  A1    ---   l_Hmag      Limit flag on H magnitude
  37- 41  F5.2  mag     Hmag      ? H magnitude
  43- 47  F5.2  mag     Kmag      K magnitude
  49- 58  A10   ---     Notes     See note (1)
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Note (1):       (1) Outside J and H images.
                (2) Irs3.
                (3) Near-IR excess. (St) Straw et al. (1989ApJS...69...99S)
                (4) Irs1. Phot. of components, in Paper I (Persi et al.,
                     1996A&A...307..591P)
               (St) Straw et al. (1989ApJS...69...99S)
                (*) Probable exciting star of HII region E.
             (Neb.) Nebular object
          (H2 Knot) Molecular hydrogen emission knot
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Acknowledgements: Mauricio Tapia <mt@bufadora.astrosen.unam.mx>
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(End)                                         Patricia Bauer [CDS]   15-Apr-1996