Pulsational Mass Ejection in Be Star Disks

TL;DR

This paper proposes a Pulsationally Driven Orbital Mass Ejection (PDOME) model for Be star disks, combining rapid rotation and non-radial pulsations to explain disk formation and stability.

Contribution

It introduces a novel PDOME model that links pulsations and rotation to mass ejection in Be stars, analyzing different pulsation modes and their impact on disk stability.

Findings

Different pulsation modes influence mass ejection efficiency.

The model predicts conditions for stable disk formation.

Non-radial pulsations can effectively launch circumstellar material.

Abstract

This work explores a Pulsationally Driven Orbital Mass Ejection (PDOME) model for the launching of Classical Be star disks. Under this model, a combination of rapid rotation and non-radial pulsation modes contribute to placing material into the circumstellar environment. Several varieties of non-radial pulsation modes, characterized by their propagation direction and the relative phase of their velocity and density perturbations, are considered. As well, the orbital stability of material launched by such a mechanism is investigated.