Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The lambda Bootis stars   In this article the current knowledge of the group of lambda Bootis stars is
reviewed. These metal poor objects are quite outstanding compared to other
chemically peculiar stars of the upper main sequence. Up to now no theory has
been developed which is able to explain the majority of observational results.
This article is mainly focused on the work which needs to be done in the future
in order to clarify the lambda Bootis phenomenon.

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The categories of this paper are: eess
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph