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J/AJ/113/1788               Near-IR Imaging Survey of NGC 2282 (Horner+ 1997)
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A Near-Infrared Imaging Survey of NGC 2282
     Horner D.J., Lada E.A., Lada C.J.
    <Astron. J. 113, 1788 (1997)>
    =1997AJ....113.1788H
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ADC_Keywords: Nebulae ; Photometry, infrared

Abstract:
    We present the first near-infrared (JHK) imaging and photometry of a
    young cluster associated with NGC 2282, a reflection nebula in
    Monoceros. Our observations reveal that the cluster is centrally
    concentrated with a surface density that falls as 1/r. The cluster has
    a radius of roughly 1.6 pc and contains at least 100 members,
    approximately 9% of which exhibit infrared excess emission
    characteristic of young stellar objects. Infrared extinction maps
    suggest that the cluster is located at the edge of a molecular cloud
    and is not heavily reddened. We construct the K-band luminosity
    function (KLF) of the cluster and find that it increases with
    magnitude up to the completeness limit of our observations
    (m_(K)=15.0). The shape of the KLF is similar to those of other young
    clusters, such as IC 348 and the Trapezium, which suggest that the
    cluster contains a significant population of pre-main sequence stars.
    However, at the distance of NGC 2282 (1.7kpc) our observations are
    not deep enough to sample the low mass end of the cluster IMF.
    Consequently, our KLF does not provide meaningful constraints on
    either the age of the cluster or the duration of star formation within
    it. On the other hand, the low extinction toward the cluster, its
    location at the edge of a molecular cloud, and the relatively small
    fraction of infrared excess sources suggest that it is a relatively
    evolved cluster of pre-main-sequence stars with an age of
    5-10x10^6^ years.
    (Copyright) 1997 American Astronomical Society.
    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
table3.dat      59        394   1995 1.5 meter telescope CIRIM data
table3.tex     144        417   AASTeX version of table3.dat
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Byte-by-byte Description of file: table3.dat
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   Bytes Format  Units    Label         Explanations
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   1-  3  I3      ---     Num           Source number
       4  A1      ---     Note         *[a-f] Note flag
   5-  6  I2      h       RAh           Right ascension, J2000
   8-  9  I2      min     RAm           Right ascension, J2000
  11- 14  F4.1    s       RAs           Right ascension, J2000
      16  A1      ---     DE-           Sign of Declination, J2000
      17  I1      deg     DEd           Declination, J2000
  19- 20  I2      arcmin  DEm           Declination, J2000
  22- 23  I2      arcsec  DEs           Declination, J2000
  25- 30  F6.2    mag     Jmag         *? J magnitude (1.20{mu}m)
  32- 35  F4.2    mag   e_Jmag          ? Error in Jmag
  37- 42  F6.2    mag     Hmag          ? H magnitude (1.62{mu}m)
  44- 47  F4.2    mag   e_Hmag          ? Error in Hmag
  49- 54  F6.2    mag     Kmag          ? K magnitude (2.20{mu}m)
  56- 59  F4.2    mag   e_Kmag          ? Error in Kmag
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Note on Note:
  a - Source 137:  nebulous object A
  b - Source 177:  HD 289120, the central star illuminating the
                   reflection nebula
  c - Source 275:  nebulous object B/EQ 0644.3+0121
  d - Source 295:  nebulous object C
  e - Source 314:  nebulous object D
  f - Source 328:  V507 Mon, spectroscopic binary
Note on Jmag:
  No color correction has been applied to the J-band magnitudes.
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Origin: AAS CD-ROM series, Volume 8, 1997         Lee Brotzman [ADS] 02-May-1997
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(End)                                                         [CDS]  04-Jul-1997