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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : sseminar_at_subaru.naoj.org (please change"_at" to @).

June 03, Wednesday, 11:00 am in 104

" The Puzzle of Li-rich Red Giants: New Insights but More Missing Pieces "

Joleen Carlberg

(NASA Goddard Space Flight Center)


The nature of Li-rich red giant stars is a decades-old problem that has both challenged and driven advancements in the field of stellar evolution modeling. These relatively rare stars also have important implications for star-planet interactions during the stellar red giant phase. Many of the exoplanets that have been discovered orbit close enough to their host stars that they cannot escape engulfment during their stars' lifetimes, and massive, engulfed planets could replenish the abundance of Li in a red giant's atmosphere. In this talk, I will summarize what we have learned about the abundance of Li during stellar evolution and which Li-rich stars may be explained by known astrophysical processes. I will highlight stars that defy our current understanding, focusing on a well-characterized Li-rich star in the open cluster NGC 6819, and will discuss future work needed to understand these 'puzzlers'.


Seminars are also held at JAC, CFHT, and IfA.



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