Access to Astronomical Catalogues

J/AJ/134/411        Properties of IC 348 members             (Muench+, 2007)
A Spitzer census of the IC 348 nebula.
    Muench A.A., Lada C.J., Luhman K.L., Muzerolle J., Young E.
   <Astron. J., 134, 411-444 (2007)>
   =2007AJ....134..411M
ADC_Keywords: Clusters, open ; Photometry, infrared ; Stars, pre-main sequence

Keywords: circumstellar matter - infrared: stars -
          open clusters and associations: individual (IC 348) -
          stars: pre-main sequence

Abstract:
    Spitzer mid-infrared surveys enable an accurate census of young
    stellar objects by sampling large spatial scales, revealing very
    embedded protostars, and detecting low-luminosity objects. Taking
    advantage of these capabilities, we present a Spitzer-based census of
    the IC 348 nebula and embedded star cluster, covering a 2.5pc region
    and comparable in extent to the Orion Nebula. Our Spitzer census
    supplemented with ground-based spectra has added 42 Class II T Tauri
    sources to the cluster membership and identified ∼20 Class 0/I
    protostars. The population of IC 348 likely exceeds 400 sources after
    accounting statistically for unidentified diskless members. Our
    Spitzer census of IC 348 reveals a population of Class I protostars
    that is anticorrelated spatially with the Class II/III T Tauri
    members, which comprise the centrally condensed cluster around a B
    star.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table12.dat       87       66   IC 348 Spitzer excess sources
table3.dat        61       66   Spitzer 3-24um data for new IC 348 members
table7.dat        76      343   Derived properties of IC 348 members


See also:
    J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)


Byte-by-byte Description of file: table12.dat

   Bytes Format Units   Label     Explanations

       1  I1    ---     Tab       [1/2] Original table number (1)
   3-  7  A5    ---     Seq       Sequential number (G1)
   9- 10  I2    h       RAh       Right ascension (J2000)
  12- 13  I2    min     RAm       Right ascension (J2000)
  15- 20  F6.3  s       RAs       Right ascension (J2000)
      22  A1    ---     DE-       Declination sign (J2000)
  23- 24  I2    deg     DEd       Declination (J2000)
  26- 27  I2    arcmin  DEm       Declination (J2000)
  29- 33  F5.2  arcsec  DEs       Declination (J2000)
  35- 38  A4    ---     r_Pos     Origin of astrometry flag (2)
  40- 58  A19   ---     SpType    Spectral type
  60- 83  A24   ---     Memb      Membership (3)
  84- 86  A3    ---     Cl        YSO Class
      87  A1    ---     n_Cl      [c] could be background source (4)

Note (1): Tab flag as follows:
      1 = spectroscopy of IC 348 Spitzer excess sources
      2 = spitzer excess sources without spectral types
Note (2): Origin of that astrometry as follows:
     2m = Muench et al. (2003AJ....125.2029M; FLAMINGOS)
   cfht = Luhman et al. (2003, Cat. J/ApJ/593/1093)
   wfpc = Luhman et al. (2005ApJ...623.1141L)
   irac = IRAC mosaics, this paper
Note (3): Membership in IC 348 is indicated by AV ≳1 and
     AV = a position above the main sequence for the distance of IC 348
     ex = excess emission in the IRAC MIPS data
    H2O = the shape of the gravity-sensitive steam bands
    NaK = NaI and KI strengths intermediate between those of dwarfs
          and giants (NaK)
     Li = strong Li absorption
      e = emission in the Balmer, Paschen, or Brackett lines of hydrogen
Note (4): These Class I sources are located away from any molecular
     material and may be background sources with SEDs that mimic
     circumstellar disks.


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     Seq       Sequential number (G1)
   7- 11  F5.2  mag     3.6mag    ? 3.6um Spitzer magnitude
  13- 16  F4.2  mag     e_3.6mag  ? rms uncertainty on 3.6mag
  18- 22  F5.2  mag     4.5mag    ? 4.5um Spitzer magnitude
  24- 27  F4.2  mag     e_4.5mag  ? rms uncertainty on 4.5mag
  29- 33  F5.2  mag     5.8mag    ? 5.8um Spitzer magnitude
  35- 38  F4.2  mag     e_5.8mag  ? rms uncertainty on 5.8mag
      40  A1    ---     l_8.0mag  Limit flag on 8.0mag
  41- 45  F5.2  mag     8.0mag    ? 8.0um Spitzer magnitude
  47- 50  F4.2  mag     e_8.0mag  ? rms uncertainty on 8.0mag
      52  A1    ---     l_24mag   Limit flag on 24mag
  53- 56  F4.2  mag     24mag     24um Spitzer magnitude
  58- 61  F4.2  mag     e_24mag   ? rms uncertainty on 24mag


Byte-by-byte Description of file: table7.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     Seq       Sequential running number (G1)
   7- 11  A5    ---     SpType    Spectral type
  13- 17  I5    K       Teff      Effective temperature
  19- 22  F4.1  mag     AV        Visual extinction (2)
  24- 27  F4.1  mag     AVlow     The 1σ lower deviation in AV (2)
  29- 32  F4.1  mag     AVup      The 1σ upper deviation in AV (2)
  34- 39  F6.3 [solLum] logL      Log of bolometric luminosity (3)
  41- 46  F6.3 [solLum] logLlow   The 1σ lower deviation in logL (3)
  48- 53  F6.3 [solLum] logLup    The 1σ upper deviation in logL (3)
  55- 60  F6.3  ---     alpha     Observed IRAC SED Slope (4)
  62- 67  F6.3  ---     e_alpha   ? The 1σ uncertainty in alpha
  69- 74  F6.3  Jy      F850um    ? Upper limit on the 850 micron flux (5)
      76  A1    ---     SES       [*] * indicates Spitzer excess source

Note (2): From SED fitting; values of 0 are real. The ±1σ
     deviations correspond to the values of the extinction which are
     1σ away from the best fit value.
Note (3): Assuming a distance of 320pc. The ±1σ deviations
     correspond to the max and min values of the luminosity assuming summed
     propagated errors.
Note (4): Value of the observed spectral index between 3 and 8 microns.

Note (5): In a 20 arcsec aperture using a sky annulus from 120-140 arcsec
     to estimate sky noise.


Global notes:

Note (G1): Sources identified as Cl* IC 348 LRL NNNNN in Simbad



History:
    From electronic version of the journal

References:
    Lada et al., Paper I      2006AJ....131.1574L, Cat. J/AJ/131/1574
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    26-Aug-2009