Accueil   >   Recherche   >   Séminaires et réunions   >   Séminaires : Precision dating of old stellar populations with helium-burning stars

Precision dating of old stellar populations with helium-burning stars

Le 6 mars 2020
De 10h30 à 12h00

Alessandro Savino

ARI Heidelberg

The study of nearby resolved galaxies is a source of transformational insights into the mechanisms that regulate galaxy evolution and it provides us with a detailed view on how star formation proceeds in the medium-to-small dark matter haloes. To date, the most precise measurements of ancient star formation rely on the detection of the oldest main sequence stars. The challenging observational requirements for a such a detection impose severe limitations on the quantity and quality of old star formation histories at our disposal.

In this talk I will describe a new approach, aimed at expanding the capabilities of ancient star formation history measurements via modelling of the old horizontal branch stars. I will show that, thanks to its brightness, the horizontal branch has the potential to deliver very precise star formation histories, for a large and cosmologically representative sample of galaxies, constituting a treasure trove for the archaeological characterization of the Local Volume.

I will illustrate present and future applications of this method to different environments, ranging from the heart of the Milky Way, to nearby dwarf galaxies, to the neighbouring groups and clusters, unveiling a new and sharper view on the ancient past of present day galaxies.

Search & Find
avril 25 2018

La date du 25 avril 2018 est attendue avec impatience par de nombreux astronomes du monde entier....

mars 5 2020

    L’observatoire astronomique de Strasbourg accueille 83 personnes, dont 56 fonctionnaires...

févr. 7 2020

Des chercheurs de Bonn et de Strasbourg ont simulé la formation de galaxies dans un Univers sans...

janv. 9 2020

Omkar Bait, astronome au NCRA (Pune, Inde) et ses collaborateurs (dont Pierre-Alain Duc,...

déc. 6 2019

Gaia Image of the Week Les amas globulaires sont des collections sphéroïdales denses d'environ un...