Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectroscopic study of the N159/N160 complex in the Large Magellanic
  Cloud   We present a spectroscopic study of the N159/N160 massive-star forming region
south of 30 Doradus in the Large Magellanic Cloud, classifying a total of 189
stars in the field of the complex. Most of them belong to O and early B
spectral classes; we have also found some uncommon and very interesting
spectra, including members of the Onfp class, a Be P Cygni star, and some
possible multiple systems. Using spectral types as broad indicators of
evolutionary stages, we considered the evolutionary status of the region as a
whole. We infer that massive stars at different evolutionary stages are present
throughout the region, favoring the idea of a common time for the origin of
recent star formation in the N159/N160 complex as a whole, while sequential
star formation at different rates is probably present in several subregions.

28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc