J/ApJ/525/466 Young low-mass stars and brown dwarfs in IC 348 (Luhman+, 1999)
Young low-mass stars and brown dwarfs in IC 348
Luhman K.L.
<Astrophys. J. 525, 466 (1999)>
=1999ApJ...525..466L 1999ApJ...525..466L
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 Å 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:
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RA (2000) DE Designation(s)
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03 44.5 +32 17 IC 348 = OCl 409 = LBN 758
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File Summary:
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FileName Lrecl Records Explanations
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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 Hα
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 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 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 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 Teff with the dwarf temperature
scale in Table 2
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History:
From ApJ electronic edition
(End) Greg Schwarz [AAS] 16-Mar-2000