Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Catalog of New Spectroscopically Confirmed Massive OB Stars in Carina   The Carina star-forming region is one of the largest in the Galaxy, and its
massive star population is still being unveiled. The large number of stars
combined with high, and highly variable, interstellar extinction makes it
inherently difficult to find OB stars in this type of young region. We present
the results of a spectroscopic campaign to study the massive star population of
the Carina Nebula, with the primary goal to confirm or reject previously
identified Carina OB star candidates. A total of 141 known O- and B-type stars
and 94 candidates were observed, of which 73 candidates had a high enough
signal-to-noise ratio to classify. We find 23 new OB stars within the Carina
Nebula, a 32% confirmation rate. One of the new OB stars has blended spectra
and is suspected to be a double-lined spectroscopic binary (SB2). We also
reclassify the spectral types of the known OB stars and discover nine new SB2s
among this population. Finally, we discuss the spatial distribution of these
new OB stars relative to known structures in the Carina NSebula.

18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom