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 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)
Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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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)
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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 2003AJ....125.2029M; FLAMINGOS)
cfht = Luhman et al. (2003, Cat. J/ApJ/593/1093)
wfpc = Luhman et al. (2005ApJ...623.1141L 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.
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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- 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
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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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
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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.
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Global notes:
Note (G1): Sources identified as Cl* IC 348 LRL NNNNN in Simbad
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History:
From electronic version of the journal
References:
Lada et al., Paper I 2006AJ....131.1574L 2006AJ....131.1574L, Cat. J/AJ/131/1574
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Aug-2009