Non-LTE Abundances in OB stars: Preliminary Results for 5 Stars in the Outer Galactic Disk

TL;DR

This study analyzes elemental abundances in distant OB stars in the outer Galactic disk using NLTE models to understand the Galaxy's chemical distribution and evolution.

Contribution

It introduces a methodology for simultaneous O and Si ionization equilibrium analysis using NLTE models for distant OB stars.

Findings

Preliminary abundance measurements for 5 stars.

Methodology based on NLTE model atmospheres.

Insights into the chemical distribution of the outer Galactic disk.

Abstract

The aim of this study is to analyse and determine elemental abundances for a large sample of distant B stars in the outer Galactic disk in order to constrain the chemical distribution of the Galactic disk and models of chemical evolution of the Galaxy. Here, we present preliminary results on a few stars along with the adopted methodology based on securing simultaneous O and Si ionization equilibria with consistent NLTE model atmospheres.