8-12 juin, 2014

Résumé

Archaeology of the Stars

Kim Venn (University of Victoria)

The most metal-poor star yet found was announced in Feb 2014, with a metallicity that is 100 times lower than previously known, and 10 million times lower than in the Sun. These jewels are thought to be related to the earliest stages of the formation and evolution of the Universe, and therefore studies of their properties complement analyses of the high redshift Universe. However, these stars are rare and require large spectroscopic surveys to find, confirm, and determine their characteristics. Stellar spectroscopic surveys can also address questions such as: How do Galactic disks form? How old is the Galactic halo? Are there minority (old, metal-poor, or accreted) populations in the Galactic Bulge? Is the Solar system unusual? In this talk, I shall review some of the early data results from the current stellar spectroscopic surveys (such as SDSS-APOGEE, GALAH, and ESO-Gaia), and discuss prospects for stellar archaeology in the next decade, such as reconstructing the lost stellar substructures of the early Milky Way to obtain a detailed physical picture of its formation and evolution.
(doit être confirmé par le SOC)