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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 (Tadayuki Kodama, Tomonori Usuda, Nagayoshi Ohashi) by email : sseminar_at_subaru.naoj.org (please change"_at_" to @).

September 13, Thursday, at 11:00 am

" Galactic Archaeology in the Ultra-Faint Dwarf Galaxies "

Luis Vargas

(Yale University)


The ultra-faint dwarf galaxies (UFDs) are the least luminous galaxies in the Universe (10^3 < L < 10^7 Lsun). Their stellar populations are extremely old (~12-13 Gy), making them unique probes of low mass galaxy evolution at high redshift. Stellar chemical abundances play an important role in understanding UFD evolution, since they are a fossil record of the conditions of the gas when stars were formed. I will report on our ongoing study of the chemical abundances of alpha elements (Mg, Si, Ca, and Ti) in eight UFDs, using medium-resolution Keck/DEIMOS spectroscopy. Our data are consistent with a population of objects that underwent very inefficient star formation. I will also discuss our chemical abundance sample in the context of the formation of the Milky Way stellar halo.


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



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