Impact of rotational mixing on the global and asteroseismic properties of red giants

TL;DR

This paper reviews how rotational mixing affects the global and asteroseismic properties of red giants, highlighting the impact of their rotational history on their evolution and observable characteristics.

Contribution

It provides a comprehensive analysis of the effects of rotational mixing on red giant evolution and seismic properties, emphasizing the importance of rotational history.

Findings

Rotational mixing increases luminosity in massive red giants.

It shifts the core helium burning phase to higher luminosity.

In lower-mass red giants, it decreases the luminosity of the bump.

Abstract

The influence of rotational mixing on the global parameters and asteroseismic properties of red giant stars is reviewed. While red giants are generally characterised by low surface rotational velocities, they may have been rotating much more rapidly during the main sequence, so that the rotational history of a star has a large impact on its properties during the red giant phase. For stars massive enough to ignite helium burning in non-degenerate conditions, rotational mixing leads to a significant increase of the stellar luminosity and shifts the location of the core helium burning phase to a higher luminosity in the HR diagram. This results in a change of the seismic properties of red giants and of the fundamental parameters of a red giant star as determined by performing an asteroseismic calibration. For red giants with a lower mass that undergo the helium flash, rotational mixing decreases the luminosity of the bump at solar metallicity changing thereby the global and asteroseismic properties of these stars.