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J/AJ/118/2409       VRI photometry of λ Ori PMS stars      (Dolan+, 1999)
A WIYN lithium survey for young stars in the λ Orionis
star-forming region.
     Dolan C.J., Mathieu R.D.
    <Astron. J. 118, 2409 (1999)>
    =1999AJ....118.2409D
ADC_Keywords: Stars, pre-main sequence ; Photometry, VRI ; Photometry, CCD

Keywords: stars: formation - stars: pre-main-sequence


Description:
    We have found 72 premain-sequence (PMS) stars near the center of the
    λ Orionis star-forming region by spectroscopically testing a
    magnitude-limited sample for the presence of lithium λ6708
    absorption, a diagnostic of youth. All of these stars show large
    lithium equivalent widths and radial velocities consistent with Orion
    membership, but only two were discovered previously via Hα or
    X-ray surveys.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        75       75   Pre-main-sequence stellar data


See also:
  J/AJ/121/2124 : Paper II (Dolan+, 2001)
          I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label    Explanations

   1-  2  I2    ---     [DM99]   [1/72] The λ Ori running number
       3  A1    ---    n_[DM99]  [aef] Individual note (1)
   5- 10  I6    ---     USNO     USNO number (2)
  12- 13  I2    h       RAh      Right Ascension from USNO-A 2.0 catalog (J2000)
  15- 16  I2    min     RAm      Right Ascension from USNO-A 2.0 catalog (J2000)
  18- 22  F5.2  s       RAs      Right Ascension from USNO-A 2.0 catalog (J2000)
      24  A1    ---     DE-      Declination sign (J2000)
  25- 26  I2    deg     DEd      Declination from USNO-A 2.0 catalog (J2000)
  28- 29  I2    arcmin  DEm      Declination from USNO-A 2.0 catalog (J2000)
  31- 35  F5.2  arcsec  DEs      Declination from USNO-A 2.0 catalog (J2000)
  37- 41  F5.2  mag     Vmag     The V band magnitude
  43- 46  F4.2  mag     V-R      The (V-R) color
  48- 51  F4.2  mag     R-I      The (R-I) color
  54- 57  F4.2  0.1nm   EWLi     ? Equivalent width of Li (3)
      58  A1    ---     n_EWLi   [c] Note on EWLi (4)
  60- 64  F5.2  0.1nm   EWHa     ? Equivalent width of Hα (5)
      65  A1    ---     n_EWHa   [c] Note on EWHa
  67- 72  F6.2  km/s    RVel     Stellar radial velocity
      73  A1    ---     n_RVel   [d] Flag on RVel (6)
      75  I1    ---     Nobs     ? Number of observations

Note (1): a: Two entries for this star (double-lined spectrum)
          e: [DM99] 6 = DIL 52, f: [DM99] 36 = DIL 54
Note (2): From the USNO-A1.0 catalog (Monet et al., 1996, See Cat. I/252,
           USNO-A2.0). Each name is in the format 0975-01 <nnnnnn>
Note (3): Positive values indicate absorption

Note (4): c: Wλ measured from the combined light of both components

Note (5): Positive values indicate emission

Note (6): d: Double-lined spectrum



History:
    From electronic version of the journal
(End)                                        Patricia Bauer [CDS]    21-Sep-2001