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J/AJ/123/387  VRI photometry of {lambda} Ori star-forming region  (Dolan+, 2002)
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A photometric study of the young stellar population throughout the
 {lambda} Orionis star-forming region.
    Dolan C.J., Mathieu R.D.
      <Astron. J. 123, 387 (2002)>
      =2002AJ....123..387D      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, pre-main sequence ; Photometry, VRI
Keywords: stars: formation - stars: pre-main-sequence

Abstract:
    We present VRI photometry of 320,917 stars with 11<~R<~18 throughout
    the {lambda} Ori star-forming region. Using the more spatially limited
    spectroscopic surveys of Dolan & Mathieu (1999, Cat. <J/AJ/118/2409>,
    2001, Cat. <J/AJ/121/2124>) to define the color-magnitude domain of
    young low-mass members of the association and removing statistically
    the field stars in this domain, we use our photometry to identify a
    representative pre-main-sequence (PMS) population throughout the
    interior of the molecular ring.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table4.dat        84   320917   VRI Photometry
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See also:
 J/AJ/118/2409 : VRI photometry of {lambda} Ori PMS stars (Dolan+, 1999)
 J/AJ/121/2124 : {lambda} Ori pre-main-sequence stars photometry (Dolan+, 2001)


Byte-by-byte Description of file: table4.dat
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   Bytes Format Units   Label     Explanations
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   1-  4  A4    ---     ---       [lOri]
   6- 22  A17   ---     lOri      Object identification, JHHMMSS.s+DDMMSSa (1)
  24- 29  F6.3  mag     Vmag      The V band magnitude (2)
  31- 36  F6.3  mag     Rmag      The R_C_ band magnitude (2)
  38- 43  F6.3  mag     Imag      The I_C_ band magnitude (2)
  45- 46  I2    h       RAh       Hour of Right Ascension (J2000)
  48- 49  I2    min     RAm       Minute of Right Ascension (J2000)
  51- 56  F6.3  s       RAs       Second of Right Ascension (J2000)
  58- 59  I2    deg     DEd       Degree of Declination (J2000)
  61- 62  I2    arcmin  DEm       Arcminute of Declination (J2000)
  64- 68  F5.2  arcsec  DEs       Arcsecond of Declination (J2000)
  70- 84  A15   ---     Field     Field number
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Note (1): The identifier, lOri JHHMMSS.s+DDMMSSa, is constructed from the
           USNO-A2.0 (Cat. <I/252>) coordinates.
          For the 110 stars where this identifier is not unique, we have
           appended an ``a'' for the westmost or a ``b'' for the eastmost star
           to distinguish between them.
Note (2): The mean photometric error is 0.032 (12<R<16),
          0.069 (16<R<17), or 0.12 (17<R<18) mag as described in the text.
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History:
    From electronic version of the journal

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(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    28-Mar-2002