Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test
  of Model Atmospheres   We describe a method for accurately determining M dwarf metallicities with
spectral synthesis based on abundance analyses of visual binary stars. We
obtained high resolution, high signal-to-noise spectra of each component of
five visual binary pairs at McDonald Observatory. The spectral types of the
components range from F7 to K3 V for the primaries and M0.5 to M3.5 V for the
secondaries. We have determined the metallicities of the primaries
differentially with respect to the Sun by fitting synthetic spectra to Fe
\textsc{i} line profiles in the observed spectra. In the course of our analysis
of the M dwarf secondaries we have made significant improvements to the PHOENIX
cool-star model atmospheres and the spectrum analysis code MOOG. Our analysis
yields a RMS deviation of 0.11 dex in metallicity values between the binary
pairs. We estimate the uncertainties in the derived stellar parameters for the
M dwarfs to be 48 K, 0.10 dex, 0.12 dex, 0.15 km s$^{-1}$, and 0.20 km s$^{-1}$
for {T}$_{eff}$, log \textsl{g}, [M/H], $\xi$, and $\eta$ respectively.
Accurate stellar evolutionary models are needed to progress further in the
analysis of cool-star spectra; the new model atmospheres warrant recalculation
of the evolutionary models.

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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: q-bio