Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of the Lyman-$\alpha$ line profile in DBA white dwarfs   The hydrogen abundances in DBA white dwarfs determined from optical or UV
spectra have been reported to differ significantly in some studies. We revisit
this problem using our own model atmospheres and synthetic spectra, and present
a theoretical investigation of the Lyman-$\alpha$ line profile as a function of
effective temperature and hydrogen abundance. We identify one possible solution
to this discrepancy and show considerable improvement from a detailed analysis
of optical and UV spectra of DBA stars.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat