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Astronomy Colloquium - Constantine Deliyannis

A picture of the Sun including a prominence of the edge of the Sun
September 21, 2023
3:00 pm - 4:00 pm
In Person & Online: Chem & Biomolecular Eng & Chem (CBEC) - Room 130; Zoom Webinar

Title: Light Element Tracers (Li, Be, B) and the Secret Lives of Sun-like Stars (and the Universe)

Abstract:

Helioseismology strongly supports the Standard Solar Model, yet the current surface solar lithium (Li) abundance is about a factor of 50 lower than that predicted by this model, betraying a secret past life that our Sun has led.  In fact, nearly all stars exhibit lower surface Li abundances than predicted by standard theory.  I will discuss how these Li abundances, together with surface stellar Be and B abundances inform us about physical processes occurring inside stars that are not included in standard theory, such as rotationally-induced mixing, diffusion, and mass loss.  I will point out implications for testing Big Bang Theory when trying to determine the primordial Li abundance from Li observations in the oldest stars.

Speaker: Constantine Deliyannis (Indiana University Bloomington)

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