Eleven years with the odd solar composition and its evolution. On the joy and problems on following a problem.

by Bengt Gustafsson (Nordita)

Wednesday 16 Jun 2021, 13:30 → 14:30 Europe/Stockholm

https://stockholmuniversity.zoom.us/j/530682073

More than a decade ago we found that the solar elemental composition is significantly different from that of most solar twins in the Solar neighborhood in the Galaxy. The easily condensible elements (refractories) are more rare in the Sun than the volatiles, all in comparison with the twins. The hope has been that this could disclose some interesting  facts about the early evolution of the Solar system. A number of different possible reasons for this ”solar oddity” were suggested — ranging from differences in planet engulfing by the central star, selective accretion of dust due to radiative forces from stars in the neighbourhood, effects of the giant planets in the accretion disk, differences in the degree of episodic accretion in the formation process of different stars, to galactic evolution effects. Exploring these possibilities led into a wide tour into astrophysics, and still more unanswered questions. The possibilities and limitations of high-precision abundance determinations of stars are illustrated.

Gustafsson_2021-Jun-16.mp4