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J/ApJ/525/466 Young low-mass stars and brown dwarfs in IC 348 (Luhman+, 1999)
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Young low-mass stars and brown dwarfs in IC 348
      Luhman K.L.
     <Astrophys. J. 525, 466 (1999)>
     =1999ApJ...525..466L
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ADC_Keywords: Photometry, infrared ; Spectroscopy ; Stars, late-type ;
              Clusters, open
Keywords: infrared: stars - stars: evolution - stars: formation - stars:
          low-mass, brown dwarfs - stars: luminosity function, mass
          function - stars: pre-main-sequence

Abstract:
    I present new results from a continuing program to identify and
    characterize the low-mass stellar and substellar populations in the
    young cluster IC 348 (0.5 - 10 Myr). Optical spectroscopy has revealed
    young objects with spectral types as late as M8.25. The intrinsic J-H
    and H-K colors of these sources are dwarflike, whereas the R-I and I-J
    colors appear intermediate between the colors of dwarfs and giants.
    Furthermore, the spectra from 6500 to 9500 {AA} are reproduced well
    with averages of standard dwarf and giant spectra, suggesting that
    such averages should be used in the classification of young late-type
    sources.

Objects:
    --------------------------------------------------
       RA   (2000)   DE    Designation(s)
    --------------------------------------------------
     03 44.5       +32 17  IC 348 = OCl 409 = LBN 758
    --------------------------------------------------

File Summary:
--------------------------------------------------------------------------------
 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table1.dat       147       70   Data for low-mass sources in IC 348
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  3  I3    ---     ID        Identification number of IC 348 source
       5  A1    ---   f_ID        [g] Indicates IR photometry includes a
                                   companion while the optical data resolve
                                   the two sources.
       8  I1    h       RAh       Right Ascension (J2000)
  10- 11  I2    min     RAm       Right Ascension (J2000)
  13- 17  F5.2  s       RAs       Right Ascension (J2000)
      18  A1    ---     DE-       Declination sign (J2000)
  19- 20  I2    deg     DEd       Declination (J2000)
  22- 23  I2    arcmin  DEm       Declination (J2000)
  25- 28  F4.1  arcsec  DEs       Declination (J2000)
  30- 35  A6    ---     SpIR      Spectral type from IR measurements
  37- 48  A12   ---     SpOpt     Spectral type from optical measurements
  49- 53  F5.1  0.1nm   EqW       ? Equivalent width of H{alpha}
  55- 56  I2    0.1nm e_EqW       ? Error in EqW
      59  A1    ---   u_EqW       [?] Indicates an uncertain EqW measurement
  61- 64  A4    ---   r_SpType    Reference for SpType
  66- 70  A5    ---     SpType    Adopted spectral type
  72- 75  I4    K       Teff      Effective temperature (1)
  77- 80  F4.2  mag     Extinc    Extinction in the J band
  82- 86  F5.3  solLum  Lbol      Bolometric luminosity
  88- 91  F4.2  mag     (R-I)H    ? (R-I) color from Herbig
                                   (1998ApJ...497..736H)
  94- 98  F5.2  mag     ImagH     ? I band magnitude from Herbig 1998
     100  A1    ---   l_R-I       Limit value for R-I
 101-104  F4.2  mag     R-I       ? (R-I) color from this work
 107-111  F5.2  mag     Imag      ? I band magnitude from this work
 113-116  F4.2  mag     (J-H)LL   ? (J-H) color from Lada & Lada
                                   (1995AJ....109.1682L)
 118-121  F4.2  mag     (H-K)LL   ? (H-k) color from Lada & Lada 1995
 124-128  F5.2  mag     KmagLL    ? K band color from Lada & Lada 1995
 131-134  F4.2  mag     (J-H)L    ? (J-H) color from Luhman et al
                                   (1998ApJ...508..347L)
 137-140  F4.2  mag     (H-K)L    ? (H-k) color from Luhman et al 1998
 143-147  F5.2  mag     KmagL     ? K band color from Luhman et al 1998
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Note (1): Adopted spectral types converted to T_eff_ with the dwarf temperature
          scale in Table 2
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History:
    From ApJ electronic edition
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(End)                                          Greg Schwarz [AAS]    16-Mar-2000