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J/AJ/127/1602       Cousins RI photometry in IC 348          (Cohen+, 2004)
A multiyear photometric study of IC 348.
    Cohen R.E., Herbst W., Williams E.C.
   <Astron. J., 127, 1602-1621 (2004)>
   =2004AJ....127.1602C
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, Cousins

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

Abstract:
    The extremely young cluster IC 348 has been monitored photometrically
    over five observing seasons from 1998 December 10 to 2003 March 26 in
    Cousins I with a 0.6m telescope at Van Vleck Observatory. Twenty-eight
    periodic variables and 16 irregular variables have been identified.
    The variability study is most sensitive for stars with I<14.3mag; at
    that brightness level, we find that 24 of the 27 known
    pre-main-sequence (PMS) cluster members in the monitored field are
    variables, illustrating the value of photometric monitoring for
    identifying PMS cluster members. Among this brighter sample, 14 of the
    16 known K or M-type weak-line T Tauri stars (WTTS) were found to be
    periodic variables, while all five of the known classical T Tauri
    stars (CTTS) were found to be irregular variables. In the full sample,
    which includes 150 stars with I as faint as 18, we find that 40% of
    the 63 WTTS are detected as variables, nearly all of them periodic,
    while 55% of the 20 CTTS are also detected as variable, with none of
    them periodic.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        65      151   Variability properties
table3.dat        17      223   Cousins I Photometry of Star Cl* IC 348 HMW 15


See also:
  J/A+A/409/147 : J magnitude of IC 348 brown dwarfs (Preibisch+, 2003)
  J/ApJ/597/555 : IR photometry of IC 348 young brown dwarfs (Mainzer+, 2003)
  J/AJ/122/866  : X-ray sources in IC 348 from Chandra (Preibisch+, 2001)
  J/ApJ/541/977 : HST observations of low-mass stars in IC 348 (Najita+, 2000)
  J/ApJ/497/736 : The young cluster IC 348 (Herbig, 1998)
  J/A+A/324/549 : Deep UVBRI photometry in IC 348 (Trullols+ 1997)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     HMW       Herbst, Maley & Williams (2000AJ....120..349H)
                                   number, Cl* IC 348 HMW NNN
   5-  7  I3    ---     LRL       ? Luhman et al. (1998ApJ...508..347L) number,
                                     Cl* IC 348 LRL NNN
       9  I1    h       RAh       Hour of right ascension (J2000)
  11- 12  I2    min     RAm       Minute of right ascension (J2000)
  14- 18  F5.2  s       RAs       Second of right ascension (J2000)
      19  A1    ---     DE-       Sign of declination (J2000)
  20- 21  I2    deg     DEd       Degree of declination (J2000)
  23- 24  I2    arcmin  DEm       Arcminute of declination (J2000)
  26- 29  F4.1  arcsec  DEs       Arcsecond of declination (J2000)
  31- 34  F4.2  mag     Rc-Ic     The Cousins (R-I) color index
  36- 40  F5.2  mag     Icmag     Average Cousins I-band magnitude
  42- 46  F5.3  mag     e_Icmag   The 1 σ error in Icmag
  48- 52  F5.3  mag     Amp       Amplitude range
  54- 59  F6.3  d       Per       ? Period
  61- 65  A5    ---     n_HMW     Additional notes on HMW (1)

Note (1): Additional notes mean the following:
      a = This is a double star with a magnitude difference of 0.2
      b = Ripepi et al. (2002A&A...391..587R) have reported the detection
          of delta Scuti-like pulsations in this star
      c = Different periods are detected in different seasons, and the
          period given here is an average over all five seasons
      d = Star varys by more than 3 σ
      e = Photometry may be contaminated by a nearby star. See Table 3 of
          Herbst, Maley, & Williams (2000AJ....120..349H)
      f = Star with no R-I or spectral type known--an R-I of 2.00 is
          assumed (see text);
      g = Several stars were detected by Duchene, Bouvier, & Simon
          (1999A&A...343..831D) as binaries with separations of less than 3"
      h = The given R-I value is an average of R-I values of stars with
          similar magnitudes and spectral types (see text);
      i = Star 47 is periodic is the 1998-1999 season but in subsequent
          seasons undergoes large-amplitude irregular variations
          (see section 4).


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

   Bytes Format Units   Label     Explanations

   1- 11  F11.3 d       JD        Julian Date of observation
  13- 17  F5.2  mag     Icmag     Cousins I-band magnitude


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    17-May-2004