Theory and Diagnostics of Hot Star Mass Loss

TL;DR

This paper reviews the theoretical understanding and diagnostic methods of mass loss in hot stars, highlighting recent advances in wind modeling, the impact of metallicity, and the implications for stellar evolution and ionising radiation.

Contribution

It provides a comprehensive update on hot star wind theory, incorporating new computational techniques and identifying key transitions affecting mass-loss rates and stellar evolution.

Findings

Updated wind models show complex dependencies on stellar parameters.

Identification of bi-stability jumps and their effects on episodic mass loss.

High mass-loss rates for very massive stars influence galaxy evolution and ionising radiation.

Abstract

Massive stars have strong stellar winds that direct their evolution through the upper Hertzsprung-Russell diagram and determine the black hole mass function. Secondly, wind strength dictates the atmospheric structure that sets the ionising flux. Thirdly, the wind directly intervenes with the stellar envelope structure, which is decisive for both single star and binary evolution, affecting predictions for gravitational wave events. Key findings of current hot-star research include: * The traditional line-driven wind theory is being updated with Monte Carlo and co-moving frame computations, revealing a rich multi-variate behaviour of the mass-loss rate dM/dt in terms of M, L, Eddington Gamma, Teff , and chemical composition Z. Concerning the latter, dM/dt is shown to depend on the iron (Fe) opacity, making Wolf-Rayet populations, and gravitational wave events dependent on host galaxy Z. * On top of smooth mass-loss behaviour, there are several transitions in the Hertzsprung-Russell diagram, involving bi-stability jumps around Fe recombination temperatures, leading to quasi-stationary episodic, and not necessarily eruptive, Luminous Blue Variable and pre-SN mass loss. * Moreover, there are kinks. At 100 Solar Masses, a high Gamma mass-loss transition implies that hydrogen-rich very massive stars have higher mass-loss rates than commonly considered. At the other end of the mass spectrum, low-mass stripped helium stars no longer appear as Wolf-Rayet stars, but as optically-thin stars. These stripped stars, in addition to very massive stars, are two newly identified sources of ionising radiation that could play a key role in local star formation as well as at high-redshift.