Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectropolarimetry with the DAO 1.8-m telescope   The fast-switching DAO spectropolarimeter mounted on the 1.8-m Plaskett
telescope started operation in 2007. Almost 14,000 medium-resolution (R=15,000)
polarimetric spectra of 65 O - F type stars have been obtained since then in
the course of three ongoing projects: the DAO Magnetic Field Survey, supporting
observations for the CFHT MiMeS survey, and an investigation of the systematic
differences between the observed longitudinal field measured with the Hbeta
line and metallic lines. The projects are briefly described here. The current
status as well as some results are presented.

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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg