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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 64 151 Variability properties
table3.dat 17 223 Cousins I Photometry of Star Cl* IC 348 HMW 15
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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
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Bytes Format Units Label Explanations
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1- 3 I3 --- HMW Herbst, Maley & Williams (2000AJ....120..349H 2000AJ....120..349H)
number, Cl* IC 348 HMW NNN
5- 7 I3 --- LRL ? Luhman et al. (1998ApJ...508..347L 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)
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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 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 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 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).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian Date of observation
13- 17 F5.2 mag Icmag Cousins I-band magnitude
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-May-2004