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 "
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,