Numerical models of planetary nebulae with different episodes of mass ejection: the particular case of HuBi 1

TL;DR

This study uses numerical models to simulate the evolution of HuBi 1-like planetary nebulae with multiple mass ejection episodes, reproducing observed emission structures and velocity diagrams.

Contribution

First combined 1D hydrodynamics and photoionization models to analyze multiple ejection events in planetary nebulae, specifically applied to HuBi 1.

Findings

Models reproduce observed emission features and structures.

Inner nebula shows intense [NII] emission, outer regions show HII emission.

Code effectively explains hydrodynamical and photoionization evolution.

Abstract

We have studied the evolution of HuBi 1-like planetary nebulae, considering several stages of mass injection. We have carried out numerical ionization+1D hydrodynamics+atomic/ionic rate models with our code Coral 1D to reproduce planetary nebulae that present multiple shells produced by different ejection events around the ionizing source. Furthermore, we are interested in comparing numerical simulations with H$\alpha$ and [NII]$\lambda$6584 emission structures and the position-velocity diagrams observed in HuBi 1. This object also has a phase where it has drastically decreased the injection of ionized photons ejected from the source. The result of these different stages of ejection is a nebula with intense [NII] line emission in the inner part of the planetary nebula and an extended HII recombination line emission around the central zone. The model for HuBi 1 shows the capability of our code to explain the hydrodynamical and photoionization evolution in ionization nebulae. This is our first step with a 1D code to study these two physical phenomena at the same time.