Stellar rotation influences lithium survival through a balance of internal mixing and magnetic effects that alter a young star’s internal temperature structure. Lithium is destroyed at temperatures above about two and a half million kelvin, so any process that changes how material is transported to deep, hot layers or that changes the stellar radius and temperature profile will affect lithium depletion. Observational studies of young open clusters consistently show a link between rotation and lithium abundance, making this connection important for using lithium as an age tracer and for understanding early stellar evolution.
Physical mechanisms
Faster rotation can enhance rotational mixing, transporting lithium from the convective envelope downward to hotter regions where it is burned. This process tends to increase depletion in stars where rotation drives strong shear and meridional circulation. At the same time, rapid rotation is associated with stronger magnetic activity and starspots. Garrett Somers and Marc H. Pinsonneault at Ohio State University proposed that magnetic activity inflates stellar radii, lowering temperatures at the base of the convective zone and therefore reducing lithium burning compared with non-inflated models. Sylvie Bouvier at Laboratoire d'Astrophysique de Grenoble has emphasized the role of early angular momentum evolution, where disk locking during the pre-main-sequence sets initial rotation rates and thereby affects the later balance between mixing and magnetic inflation.
Observational evidence and consequences
Empirical work supports a complex picture rather than a single rule. David R. Soderblom at the Space Telescope Science Institute and Richard D. Jeffries at Keele University have reported that in clusters such as the Pleiades, many rapidly rotating young stars retain higher surface lithium than slower rotators of the same mass. This observational signature aligns with models in which magnetic inflation in fast rotators counteracts rotational mixing. The net effect depends on mass, age, and the star’s rotational history, so lithium patterns vary between clusters and stellar populations.
These interactions matter beyond stellar physics. Lithium abundance is used to estimate stellar ages and to study chemical evolution of star-forming regions, affecting how astronomers interpret planet formation timelines and population differences across the Galaxy. Nuanced differences in rotation histories across environments and the observational biases of surveys influence conclusions, so integrating rotation, magnetic activity, and lithium measurements yields more reliable inferences about young stars.