J/A+A/542/A33 3 M dwarfs near-infrared spectra (Onehag+, 2012)
M dwarf metallicities. A high-resolution spectroscopic study in the
near-infrared.
Onehag A., Heiter U., Gustafsson B., Piskunov N., Plez B., Reiners A.
<Astron. Astrophys. 542, A33 (2012)>
=2012A&A...542A..33O 2012A&A...542A..33O
ADC_Keywords: Stars, dwarfs ; Stars, M-type ; Spectra, infrared
Keywords: stars: atmospheres - stars: binaries visual - stars: low-mass -
stars: abundances - techniques: spectroscopic
Abstract:
The relatively large spread in the derived metallicities ([Fe/H]) of M
dwarfs shows that various approaches have not yet converged to
consistency. The presence of strong molecular features, and incomplete
line lists for the corresponding molecules have made metallicity
determinations of M dwarfs difficult. Furthermore, the faint M dwarfs
require long exposure times for a signal-to-noise ratio sufficient for a
detailed spectroscopic abundance analysis.
We present a high-resolution (R∼50000) spectroscopic study of a sample
of eight single M dwarfs and three wide-binary systems observed in the
infrared J-band.
Description:
The observations were carried out in service mode with the infrared
spectrometer CRIRES at ESO-VLT.
In total 14 targets were observed during periods 82 (1st of October
2008 to 31st of March 2009) and 84 (1st of October 2009 to 31st of
March 2010).
Objects:
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RA (2000) DE Designation(s)
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11 42 10.55 +26 42 30.5 GJ 436 = HIP 57087 (fig1.dat)
06 52 18.05 -05 10 25.4 GJ 250A = HIP 32984 (fig2.dat)
06 52 18.05 -05 11 24.2 GJ 250B = TYC 4808-765-1 (fig3.dat)
22 09 40.34 -04 38 26.6 GJ 849 = HIP 109388 (fig4.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 71 655 Synthetic and observed spectra for GJ 436
fig2.dat 45 8168 Synthetic and observed spectra for GJ 250A
fig3.dat 45 8168 Synthetic and observed spectra for GJ 250B
fig4.dat 45 8168 Synthetic and observed spectra for GJ 849
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Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1 I1 --- Panel [1/2] Panel number
8- 16 F9.3 0.1nm lambda [11953/11998] Wavelength
23- 32 F10.8 --- Flux Normalized flux
38- 45 F8.6 --- Fit Synthetic fit, with adopted Teff=3263K
51- 58 F8.6 --- Fit-200 Synthetic fit, with adopted Teff=3263-200K
64- 71 F8.6 --- Fit+200 Synthetic fit, with adopted Teff=3263+200K
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Byte-by-byte Description of file: fig2.dat fig3.dat fig4.dat
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Bytes Format Units Label Explanations
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1 I1 --- Seg [1/8] Seg number
8- 16 F9.3 0.1nm lambda [11373/13059] Wavelength
23- 32 F10.8 --- Flux Normalized flux
38- 45 F8.6 --- Fit Synthetic fit
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Acknowledgements:
Anna Onehag, Anna.Onehag(at)fysast.uu.se
(End) Patricia Vannier [CDS] 18-Jun-2012