Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The FeH Wing-Ford Band in Spectra of M Stars   We study the FeH Wing-Ford band at 9850 - 10200 Angstrons by means of the fit
of synthetic spectra to the observations of M stars, employing recent model
atmospheres. On the basis of the spectrum synthesis, we analyze the dependence
of the band upon atmospheric parameters. FeH lines are a very sensitive surface
gravity indicator, being stronger in dwarfs. They are also sensitive to
metallicity (Allard & Hauschildt 1995). The blending with CN lines, which are
stronger in giants, does not affect the response of the Wing-Ford band to
surface gravity at low resolution (or high velocity dispersions) because CN
lines, which are spread all along the spectrum, are smeared out at convolutions
of FWHM $\simgreat$ 3 Angstrons. We conclude that the Wing-Ford band is a
suitable dwarf/giant indicator for the study of composite stellar populations.

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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: eess