Miércoles 05/02: Into the Unknown: Hidden Fossil Relics that shaped the Halo of the Milky Way.

Seminario extraordinario IATE (atención a la fecha)

Título: “Into the Unknown: Hidden Fossil Relics that shaped the Halo of the Milky Way”

Expositor: Dr. José Gregorio Fernández-Trincado  (Universidad de Atacama, Copiapó, Chile)

Date: Miércoles 5 de febrero de 2020, 11 hs, Auditorio IATE.

Abstract: APOGEE contains more than hundred thousands of giant stars. This enabled us to collect an unprecedented and homogeneous sample of giant stars with light-element abundance variations similar to observed in “second-generation” globular cluster stars. If they are really former members of dissolved globular clusters, stars in these groups should show some of the basic SG-like chemical patterns known for stars currently belonging to the Milky Way globular clusters, such as depletion in C and O together with N and Al enrichments. Here, I will present the results of an updated census of Unexplained/SG-like stars from a near-infrared manual analysis using the Brussels Automatic Stellar Parameter (BACCHUS) which have allowed us to compile the main element families, namely the light elements (C, N), alpha-elements (O, Mg, Si), iron-peak element (Fe), s-process elements (Ce, Nd), and the light odd-Z elements (Na, Al) for every line of possible cluster member stars, which they migrate to the disk, halo, and bulge as unbound stars, and become part of the general stellar population of the Milky Way.

Sobre el expositor: 

El Dr. José Gregorio Fernández-Trincado es Graduado en Física, Universidad de los Andes, en Venezuela. PhD en Astrofísica, Observatorio de Besançon, Francia. Posdoc en Universidad de Concepción, Chile. Profesor Asistente, Universidad de Atacama, Copiapó, Chile.
Experiencia en datos cinemáticos y modelización dinámica de estrellas para reconstruir la historia de la Vía Láctea. Desarrollo de GravPot16, utilizado para datos de GAIA y en la modelización del bulge y disco interior de la MW. Activamente involucrado en el survey APOGEE y en GAIA.