Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational Properties of Primordial Stellar Populations   We present the first results of a study of the expected properties of the
first stellar generations in the Universe. In particular, we consider and
discuss a series of properties that, on the basis of the emission from
associated HII regions, permit one to discern {\it bona fide} primeval stellar
generations from the ones formed after pollution from supernova explosions. The
expected performance of NGST for the study and the characterization of
primordial sources is also discussed.

25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
22
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: q-alg
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
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The categories of this paper are: nlin
2
The categories of this paper are: math
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex