Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elemental abundances of the supergiant stars {\sigma} Cygnus and {\eta}
  Leonis   This study aims to analyse the elemental abundances for the late B type
supergiant star $\sigma$ Cyg and the early A-type supergiant $\eta$ Leo using
ATLAS9 (Kurucz, 1995; Sbordone et al., 2004), assuming local thermodynamic
equilibrium (LTE). The spectra used in this study are obtained from Dominion
Astrophysical Observatory and have high resolution and signal-to-noise ratios.
The effective temperature and the surface gravity of $\sigma$ Cyg are
determined from the ionisation equilibria of Al I/II, Mg I/II, Fe I/II, Fe
II/III , and by fitting to the wings of H$_\gamma$ and H$_\beta$ profiles as
$\textit{T}$$_{eff}$ = 10388 K and log $\textit{g}$ = 1.80. The elemental
abundances of $\eta$ Leo} are determined using $\textit{T}$$_{eff}$ = 9600 K
and log $\textit{g}$ = 2.00, as reported by Przybilla et al. (2006).
  The ionisation equilibria of C I/II, N I/II, Mg I/II, Ca I/II, Cr I/II and Fe
I/II/III are also satisfied in the atmosphere of $\eta$ Leo. The radial
velocities of $\sigma$ Cyg and $\eta$ Leo are -7.25$\pm$7.57 km s$^{-1}$ and
10.40 $\pm$ 13.37 km s$^{-1}$, respectively. The derived projected rotational
velocities \textit{vsini} from synthetic spectra are 27 and 2 km s$^{-1}$ for
both stars, respectively. The macroturbulent velocities ($\zeta$) are 24 $\pm$
2 km s$^{-1}$ and 14.5 $\pm$ 1.5 km s$^{-1}$. Also, the microturbulent
velocities ($\xi$) have been determined for both of stars as 3.5 km s$^{-1}$.
The CNO abundance results of $\sigma$ Cyg and $\eta$ Leo show C deficiency, N
overabundance and O in excess.

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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: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th