Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of heavy-metal lines in the spectrum of the circumstellar
  envelope of a post-AGB star   Splitting of the strongest absorption lines with a lower-level excitation
potential $\chi<$1eV has been detected for the first time in the optical
spectra of the post-AGB star V354Lac obtained with a spectral resolution
R=60000 at the 6-m telescope BTA. Analysis of the kinematics shows that the
short-wavelength component of the split line originates in the star's thick
gas-dust envelope. Disregarding the splitting of strong lines when the chemical
composition is calculated leads to overestimated excess of s-process elements
(Ba, La, Ce, Nd) in the stellar atmosphere. The profiles of strong absorption
lines have been found to be variable. The available radial-velocity data
suggest the absence of any trend in the velocity field in the atmosphere and
circumstellar envelope of V354Lac over 15 years of its observations.

18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs