Asteroseismology and evolution of EHB stars
Roy H. {\O}stensen
TL;DR
This paper reviews how asteroseismology helps understand the formation and evolution of Extreme Horizontal Branch stars by comparing observed properties with theoretical models.
Contribution
It summarizes recent progress in using asteroseismology to differentiate between various evolutionary pathways of EHB stars.
Findings
Asteroseismology provides key physical parameters of EHB stars.
Comparison with models helps identify their formation channels.
Recent progress enhances understanding of EHB star evolution.
Abstract
The properties of the Extreme Horizontal Branch stars are quite well understood, but much uncertainty surrounds the many paths that bring a star to this peculiar configuration. Asteroseismology of pulsating EHB stars has been performed on a number of objects, bringing us to the stage where comparisons of the inferred properties with evolutionary models becomes feasible. In this review I outline our current understanding of the formation and evolution of these stars, with emphasis on recent progress. The aim is to show how the physical parameters derived by asteroseismology can enable the discrimination between different evolutionary models.
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