The Driving of Hot Star Winds
Andreas A.C. Sander

TL;DR
This paper reviews the fundamental principles, modeling methods, and recent advances in understanding hot star winds, emphasizing line-driven mechanisms, instabilities, and the influence of stellar companions.
Contribution
It provides a comprehensive overview of classical and modern models of hot star winds, highlighting recent simulation techniques and unresolved challenges in the field.
Findings
Line-driven winds are ubiquitous among hot, massive stars.
Recent simulations improve understanding of wind acceleration and instabilities.
Companion stars significantly affect radiation-driven wind dynamics.
Abstract
In the regime of hot stars, winds were not seen as a common thing until the era of UV astronomy. Since we have access to the UV wavelength range, it has become clear that winds are not an exotic phenomenon limited to some special objects, but actually ubiquitous among hot and massive stars. The opacities due to spectral lines are the decisive ingredient that allows hot, massive stars to launch powerful winds. While the fundamental principles of these so-called line-driven winds have been realized decades ago, their proper quantitative prediction is still a major challenge today. Established theoretical and empirical descriptions have allowed us to make major progress on all astrophysical scales. However, we are now reaching their limitations as we still lack various fundamental insights on the nature of hot star winds, thereby hampering us from drawing deeper conclusions, not least when…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Astro and Planetary Science
