Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Supergiants   A-type supergiants are primary targets for quantitative spectroscopy of
individual stars in nearby galaxies because of their intrinsic brightness. An
overview is given on the non-LTE techniques required for their analysis.
Applications concentrate on placing observational constraints on evolutionary
models for massive stars and their host galaxies by detailed abundance
analyses. Results from high-resolution studies of A-type supergiants in Local
Group galaxies and from intermediate-resolution multi-object spectroscopy of
supergiants far beyond the Local Group are summarised.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th