Analysis of Keck high-resolution spectra of VB 10
Schweitzer, Andreas Hauschildt, Peter H. Allard, France Basri G.
Schweitzer, Andreas
Hauschildt, Peter H.
Allard, France
Basri G.
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1996-12-01
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Article
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Keywords
Atomic processes,Line: profiles,Stars: atmospheres,Stars: fundamental parameters,Stars: individual: VB 10,Stars: low-mass, brown dwarfs
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Citation
Andreas Schweitzer, Peter H. Hauschildt, France Allard, G. Basri, Analysis of Keck high-resolution spectra of VB 10, Monthly Notices of the Royal Astronomical Society, Volume 283, Issue 3, December 1996, Pages 821–829, https://doi.org/10.1093/mnras/283.3.821
Abstract
We use a preliminary version of our 'NextGen' grid of cool star model atmospheres to compute synthetic line profiles which fit high-resolution Keck spectra of the cool M dwarf VB 10 satisfactorily well. We show that the parameters derived from the Keck data are consistent with the parameters derived from lower resolution spectra with larger wavelength coverage. We discuss the treatment of van der Waals broadening in cool stellar atmospheres that are dominated by molecules (mostly H2). The line profiles are dominated by van der Waals pressure broadening and are a sensitive indicator for the gravity and metallicity. Therefore the high-resolution Keck spectra are useful for determining the parameters of M dwarfs. There is some ambiguity between the metallicity and gravity. For VB 10, we find from the high-resolution spectra that 5.0 < log g < 5.5 and 0 < [M/H] < +0.5 for an adopted fixed effective temperature of 2700 K, which is consistent with recent interior calculations.
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This is an open access article under the CC BY license.
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Blackwell Publishing Ltd
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Monthly Notices of the Royal Astronomical Society
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00358711