Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metallicity of M dwarfs IV. A high-precision [Fe/H] and Teff technique
  from high-resolution optical spectra for M dwarfs   Aims. In this work we develop a technique to obtain high precision
determinations of both metallicity and effective temperature of M dwarfs in the
optical.
  Methods. A new method is presented that makes use of the information of 4104
lines in the 530-690 nm spectral region. It consists in the measurement of
pseudo equivalent widths and their correlation with established scales of
[Fe/H] and $T_{eff}$.
  Results. Our technique achieves a $rms$ of 0.08$\pm$0.01 for [Fe/H],
91$\pm$13 K for $T_{eff}$, and is valid in the (-0.85, 0.26 dex), (2800, 4100
K), and (M0.0, M5.0) intervals for [Fe/H], $T_{eff}$ and spectral type
respectively. We also calculated the RMSE$_{V}$ which estimates uncertainties
of the order of 0.12 dex for the metallicity and of 293 K for the effective
temperature. The technique has an activity limit and should only be used for
stars with $\log{L_{H_{\alpha}}/L_{bol}} < -4.0$. Our method is available
online at \url{http://www.astro.up.pt/resources/mcal}.

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The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat