Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of additional Wolf-Rayet stars in the starburst cluster
  Westerlund 1 with SOAR   We report the detection of 3 additional Wolf-Rayet stars in the young cluster
Westerlund 1. They were selected as emission-line star candidates based on 1
micron narrow-band imaging of the cluster carried out at OPD/LNA (Brazil), and
then confirmed as Wolf-Rayet stars by K-band spectroscopy performed at the 4.1
m SOAR telescope (Chile). Together with previous works, this increases the
population of Wolf-Rayet stars detected in the cluster to 22 members. Moreover,
it is presented for the first time a K-band spectrum of the luminous blue
variable W243, which apparently implies in a higher temperature than that
derived from optical spectra taken in 2003. The WC9 star WR-F was also
observed, showing clear evidence of dust emission in the K-band.

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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
2
The categories of this paper are: math
14
The categories of this paper are: math-ph