Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of two bright DO-type white dwarfs   We discovered two bright DO-type white dwarfs, GALEXJ053628.3+544854
(J0536+5448) and GALEX231128.0+292935(J2311+2929), which rank among the eight
brightest DO-type white dwarfs known. Our non-LTE model atmosphere analysis
reveals effective temperatures and surface gravities of
$T_{\mathrm{eff}}=80000\pm4600\,\mathrm{K}$ and $\log \mathrm{g}=8.25\pm0.15$
for J0536+5448 and $T_{\mathrm{eff}}=69400\pm900\,\mathrm{K}$ and $\log
\mathrm{g}=7.80\pm0.06$ for J2311+2929. The latter shows a significant amount
of carbon in its atmosphere ($C=0.003^{+0.005}_{-0.002}$, by mass), while for
J0536+5448 we could derive only an upper limit of $C<0.003$. Furthermore, we
calculated spectroscopic distances for the two stars and found a good agreement
with the distances derived from the Gaia parallaxes.

2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con