MUSE 3D spectroscopy of BA-type supergiants in NGC 300

TL;DR

This paper uses MUSE integral field spectroscopy to analyze B and A-type supergiants in NGC 300, improving stellar parameter estimates and extending the flux-weighted gravity luminosity relationship for distance measurement.

Contribution

It introduces a hybrid LTE+non-LTE analysis method and demonstrates the potential of IFS for extragalactic stellar studies, extending the FGLR for distance determination.

Findings

Improved stellar parameters for supergiants in NGC 300.

Extended the flux-weighted gravity luminosity relationship.

Showcased the potential of integral field spectroscopy for extragalactic stellar analysis.

Abstract

We present the results obtained using spectroscopic data taken with the intermediateresolution Multi Unit Spectroscopic Explorer (MUSE) of B and A-type supergiants and bright giants in the Sculptor Group galaxy NGC 300. For our analysis, a hybrid local thermodynamic equilibrium (LTE) line-blanketing+non-LTE method was used to improve the previously published results for the same data. In addition, we present some further applications of this work, which includes extending the flux-weighted gravity luminosity relationship (FGLR), a distance determination method for supergiants. This pioneering work opens up a new window to explore this relation, and also demonstrates the enormous potential of integral field spectroscopy (IFS) for extragalactic quantitative stellar studies.