Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peculiarities of the atmosphere and envelope of a post-AGB star, the
  optical counterpart of IRAS 23304+6347   Based on high-spectral resolution observations performed with the echelle
spectrograph NES of the 6-meter telescope, we have studied the peculiarities of
the spectrum and the velocity field in the atmosphere and envelope of the
optical counterpart of the infrared source IRAS 23304+6347. We have concluded
about the absence of significant variations in the radial velocity Vr inferred
from atmospheric absorptions and about its coincidence with the systemic
velocity deduced from radio data. The envelope expansion velocity Vexp=15.5
km/s has been determined from the positions of rotational band lines of the
C$_2$ Swan (0; 0) band. A complex emission-absorption profile of the Swan (0;
1) 5635 \AA{} has been recorded. Analysis of the multicomponent NaI~D doublet
line profile has revealed interstellar components V(IS)=$-61.6$ and $-13.2$
km/s as well as a circumstellar component with V(CS)=$-41.0$ km/s whose
position corresponds to the velocity inferred from C$_2$ features. The presence
of the interstellar component with Vr=$-61.6$ km/s in the spectrum allows d=2.5
kpc to be considered as a lower limit for the distance to the star. A splitting
of the profiles for strong absorptions of ionized metals (YII, BaII, LaII,
SiII) attributable to the presence of a short-wavelength component originating
in the circumstellar envelope has been detected in the optical spectrum of
IRAS23304+6347 for the first time.

1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga