J/A+A/503/639 NIR spectral of M-T dwarfs (Testi, 2009)
A low-resolution near-infrared spectral library of M-, L-, and T-dwarfs.
Testi L.
<Astron. Astrophys. 503, 639 (2009)>
=2009A&A...503..639T 2009A&A...503..639T
ADC_Keywords: Stars, dwarfs ; Stars, late-type ; Spectra, infrared
Keywords: stars: low-mass, brown dwarfs - stars: fundamental parameters -
infrared: stars
Abstract:
We present complete near-infrared (0.85-2.45um), low-resolution
(R∼100) spectra of a sample of 54 disk M-, L-, and T-dwarfs with
reliable optical or near infrared spectral-type classification from
the literature. The observations were obtained with a prism-based
optical element, the Amici device, which provides a complete spectrum
of the source on the detector. Our observations indicate that
low-resolution near-infrared spectroscopy can be used to determine the
spectral classification of late-type field dwarfs in a fast but
accurate way. We derive a set of near-infrared spectral indices that
are useful to the classification of field dwarfs not seriously
affected by reddening. Finally, we show that the comparison of Amici
spectra with model atmospheres allows us to obtain a reliable estimate
of the dwarf effective temperatures
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 126 54 Observed M-, L-, and T-dwarfs
sp/* . 54 Individual spectra
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See also:
J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)
J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002)
J/AJ/126/2487 : T dwarfs in the southern hemisphere (Burgasser+, 2003)
J/AJ/127/3553 : JHK photometry and spectroscopy for L & T dwarfs (Knapp 2004)
J/AJ/127/3553 : L and T dwarfs JHK photometry & spectroscopy (Knapp+, 2004)
J/PASP/118/659 : RI photometry of 2MASS late M and L dwarfs (Liebert+, 2006)
J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)
J/AJ/132/866 : New M dwarfs in solar neighborhood (Riaz+, 2006)
J/ApJ/637/1067 : Near-IR spectral classification of T dwarfs (Burgasser+ 2006)
J/ApJ/648/629 : Radio obs. of late M, L, and T dwarfs (Berger+, 2006)
J/ApJ/651/502 : Spitzer IRAC photometry of M, L, and T dwarfs (Patten+, 2006)
J/MNRAS/383/831 : New DENIS nearby L and late-M dwarfs (Phan-Bao+, 2008)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Name Star name
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 36 F4.1 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 46 I2 arcsec DEs Declination (J2000)
48- 51 A4 --- SpType MK spectral type (1)
53- 62 A10 "DD/MM/YYYY" Obs.Date Observation date
64 I1 --- Ref [1/5] Reference (2)
66- 89 A24 --- SName Simbad name
91- 96 A6 --- Note Note
97-126 A30 --- FileName Name of the file containing the spectra
in sp subdirectory
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Note (1): For M- and L-dwarfs we list the optical spectral types (from the
reference in column 4), for T-dwarfs we list the NIR spectral types
(from Burgasser et al., 2004, Cat. J/AJ/127/2856)
Note (2): References as follows:
1 = Burgasser et al. (2004, Cat. J/AJ/127/2856)
2 = Henry et al. (1994AJ....108.1437H 1994AJ....108.1437H)
3 = Kirkpatrick et al. (1995AJ....109..797K 1995AJ....109..797K)
4 = Kirkpatrick et al. (1999ApJ...519..802K 1999ApJ...519..802K)
5 = Kirkpatrick et al. (2000AJ....120..447K 2000AJ....120..447K)
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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3- 8 F6.4 um lambda Wavelength
10- 19 F10.7 --- Flux Flux normalized to the average flux
between 1.235 and 1.305um
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Acknowledgements:
Leonardo Testi, ltesti(at)eso.org
(End) Patricia Vannier [CDS] 22-Jun-2009