Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A search for Vega-like fields in OB stars   Very weak magnetic fields (with a longitudinal component below 1 Gauss) have
recently been discovered in the A star Vega as well as in a few Am stars.
According to fossil field scenarios, such weak fields should also exist in more
massive stars. In the framework of the ANR project Imagine, we have started to
investigate the existence of this new class of very weakly magnetic stars among
O and B stars thanks to ultra-deep spectropolarimetric observations. The first
results and future plans are presented.

10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
18
The categories of this paper are: econ
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
22
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: patt-sol
31
The categories of this paper are: ao-sci