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J/AJ/121/3160       JHK photometry near the Trapezium region  (Carpenter+, 2001)
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Near-infrared photometric variability of stars toward the
 Orion A molecular cloud.
    Carpenter J.M., Hillenbrand L.A., Skrutskie M.F.
   <Astron. J. 121, 3160 (2001)>
   =2001AJ....121.3160C
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ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, infrared
Keywords: infrared radiation - stars: individual (YY Orionis, BM Orionis) -
          stars: pre-main-sequence - stars: variables: general

Abstract:
    We present an analysis of J, H, and Ks time-series photometry obtained
    with the southern 2MASS telescope over a 0.84{deg}x6{deg} region
    centered near the Trapezium region of the Orion Nebula cluster. These
    data are used to establish the near-infrared variability properties of
    premain-sequence stars in Orion on timescales of ~1-36days, ~2 months,
    and ~2 years. A total of 1235 near-infrared variable stars are
    identified, ~93% of which are likely associated with the Orion A
    molecular cloud.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table4.dat        87     1235   Near-Infrared Variable Stars
table7.dat        42      233   Periodic Stars
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Byte-by-byte Description of file: table4.dat
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   Bytes Format Units   Label     Explanations
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   1-  5  I5    ---     [CHS2001] Star identification number
   7- 15  F9.6  deg     RAdeg     Right ascension in decimal degrees (J2000)
  17- 25  F9.6  deg     DEdeg     Declination in decimal degrees (J2000)
  27- 32  F6.3  mag     Jmag      ? The average J magnitude
  34- 39  F6.3  mag     Hmag      The average H magnitude
  41- 46  F6.3  mag     Kmag      The average K_s_ magnitude
  48- 52  F5.3  mag   e_Jmag      ? Observed rms in Jmag
  54- 58  F5.3  mag   e_Hmag      ? Observed rms in Hmag
  60- 64  F5.3  mag   e_Kmag      ? Observed rms in Kmag
  66- 67  I2    ---   o_Jmag      Number of high-quality Jmag photometric
                                   measurements used to assess the variability
  69- 70  I2    ---   o_Hmag      Number of high-quality Hmag photometric
                                   measurements used to assess the variability
  72- 73  I2    ---   o_Kmag      Number of high-quality Kmag photometric
                                   measurements used to assess the variability
  75- 79  F5.2  ---     Index     Stetson variability index
      81  I1    ---     Flag1     [0/1] Variable on 16 nights common to entire
                                        area (1)
      82  I1    ---     Flag2     [0/1] Variable in March-April 2000 data (1)
      83  I1    ---     Flag3     [0/1] Long-term variability in 2000 February
                                        and/or 1998 March (1)
      84  I1    ---     Flag4     [0/1] Periodic variable (1)
      85  I1    ---     Flag5     [0/1] Eclipsing candidate  (1)
      86  I1    ---     Flag6     [0/1] Selected as variable from subjective
                                   inspection of light curve (1)
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Note (1):
    1 = star exhibits this type of variability;
    0 = star does not exhibits this type of variability.
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Byte-by-byte Description of file: table7.dat
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   Bytes Format Units   Label     Explanations
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   1-  5  I5    ---     [CHS2001] Star identification number
   7- 11  F5.2  d       PerJ      ? The J band period
  13- 17  F5.2  d       PerH      The H band period
  19- 23  F5.2  d       PerK      The K_s_ band period
      25  A1    ---   l_FAPJ      Limit flag on FAPJ
  26- 29  F4.2  ---     FAPJ      ? The J band false-alarm probability (FAP)
                                     that the power spectrum peak could have
                                     resulted from random noise
      31  A1    ---   l_FAPH      Limit flag on FAPH
  32- 35  F4.2  ---     FAPH      The H band false-alarm probability (FAP) that
                                   the power spectrum peak could have resulted
                                   from random noise
      37  A1    ---   l_FAPK      Limit flag on FAPK
  38- 41  F4.2  ---     FAPK      The K_s_ band false-alarm probability (FAP)
                                   that the power spectrum peak could have
                                   resulted from random noise
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History:
    From electronic version of the journal
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(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    27-Sep-2001