Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The VLT-FLAMES survey of massive stars: Evolution of surface N
  abundances and effective temperature scales in the Galaxy and Magellanic
  Clouds   We present an analysis of high resolution VLT-FLAMES spectra of 61 B-type
stars with relatively narrow-lined spectra located in 4 fields centered on the
Milky Way clusters; NGC3293 & NGC4755 and the Large and Small Magellanic cloud
clusters; NGC2004 and NGC330. For each object a quantitative analysis was
carried out using the non-LTE model atmosphere code TLUSTY; resulting in the
determination of their atmospheric parameters and photospheric abundances of
the dominant metal species (C, N, O, Mg, Si, Fe). The results are discussed in
relation to our earlier work on 3 younger clusters in these galaxies; NGC6611,
N11 and NGC346 paying particular attention to the nitrogen abundances which are
an important probe of the role of rotation in the evolution of stars. This work
along with that of the younger clusters provides a consistent dataset of
abundances and atmospheric parameters for over 100 B-type stars in the three
galaxies. We provide effective temperature scales for B-type dwarfs in all
three galaxies and for giants and supergiants in the SMC and LMC. In each
galaxy a dependence on luminosity is found between the three classes with the
unevolved dwarf objects having significantly higher effective temperatures. A
metallicity dependence is present between the SMC and Galactic dwarf objects,
and whilst the LMC stars are only slightly cooler than the SMC stars, they are
significantly hotter than their Galactic counterparts.

20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics