Sommaire:

It is well understood the light element lithium in stars generally gets destroyed. Thus, stars are known as lithium sinks. Contrary to this general understanding a few stars show large amount of lithium. In some rare cases this amount exceeds the present interstellar value of A(Li)= 3.2 dex by about a factor of 10. This has been a nagging problem in stellar astrophysics for more than 4 decades since its first discovery in early 1980s. In this discuss the problem and observational efforts leading to evidence of large lithoum origin in red giants.

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