Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Red Supergiants as cosmic abundance probes: the first direct metallicity
  determination of NGC 4038 in the Antennae   We present a direct determination of the stellar metallicity in the close
pair galaxy NGC~4038 (D = 20 Mpc) based on the quantitative analysis of
moderate resolution KMOS/VLT spectra of three super star clusters (SSCs). The
method adopted in our analysis has been developed and optimised to measure
accurate metallicities from atomic lines in the $J$-band of single red
supergiant (RSG) or RSG-dominated star clusters. Hence, our metallicity
measurements are not affected by the biases and poorly understood systematics
inherent to strong line HII methods which are routinely applied to massive data
sets of galaxies. We find [Z]= +0.07 $\pm$ 0.03 and compare our measurements to
HII strong line calibrations. Our abundances and literature data suggest the
presence of a flat metallicity gradient, which can be explained as
redistribution of metal-rich gas following the strong interaction.

34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc