Page "HD 82943" Paragraph 2

Announced in 2001, HD 82943 was found to contain an unusually high amount of Lithium-6.

Stars do not naturally contain Lithium-6, but unlike stars, planets never reach temperatures that are high enough to burn their initial content of Lithium-6 ( planets should retain Lithium-6 ).

The simplest and most convincing answer to explain this observation is that one or more planets, or at least planetary material, have fallen into the star, sometime after it passed through its early evolutionary stage.