Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VeSElkA: Vertical Stratification of Element Abundances in CP stars   A portion of the upper main-sequence stars, called chemically peculiar (CP)
stars, show significant abundance anomalies mainly due to atomic diffusion of
chemical elements within the stellar atmospheres of these stars. Slowly
rotating CP stars may have hydrodynamically stable atmospheres where the
competition between the gravitational and radiative forces leads to atomic
diffusion that can be responsible for the abundance peculiarities observed in
CP stars. Recently, project VeSElkA (Vertical Stratification of Element
Abundances) was initiated with the aim to detect and study the vertical
stratification of element abundances in the atmospheres of CP stars. Some
results from abundance analysis of several slowly rotating (V$\sin{i}$< 40
km/s) CP stars observed recently with ESPaDOnS are presented here. Signatures
of vertical abundance stratification for several chemical elements have been
found in the stellar atmospheres of HD~22920, HD~41076, HD~95608, HD~116235,
HD~148330 and HD~157087.

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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: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph