# Emission-line Diagnostics of Nearby HII Regions Including Supernova Hosts

## TL;DR

This paper introduces a new model combining binary star evolution and photoionization to better understand emission lines in nearby HII regions, aiding in the analysis of stellar populations and supernova progenitors.

## Contribution

It presents a novel integrated modeling approach that accounts for binary star effects, improving the interpretation of emission-line diagnostics in star-forming regions.

## Key findings

- Models with massive binary stars match observational data.
- Binary-inclusive models estimate ages and masses of HII regions accurately.
- Provides constraints on supernova progenitors based on nebular emission.

## Abstract

We present a new model of the optical nebular emission from HII regions by combin- ing the results of the Binary Population and Spectral Synthesis (bpass) code with the photoion- ization code cloudy (Ferland et al. 1998). We explore a variety of emission-line diagnostics of these star-forming HII regions and examine the effects of metallicity and interacting binary evo- lution on the nebula emission-line production. We compare the line emission properties of HII regions with model stellar populations, and provide new constraints on their stellar populations and supernova progenitors. We find that models including massive binary stars can successfully match all the observational constraints and provide reasonable age and mass estimation of the HII regions and supernova progenitors.