…
comment: The repository administrator has not yet configured an RDF license.
primary topic: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys

Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys
type: Article
abstract: The Milky Way is traditionally depicted as a composite of three main stellar components: the halo, disk, and bulge. The closer we look and the more information we gather, this picture becomes more complicated. The components are in fact overlapping in stellar properties, such as positions, kinematics, ages, and chemical composition. The most promising way to further our understanding of the formation of the Milky Way, the main aim of Galactic Archaeology, is to explore chemical information and stellar ages with large stellar surveys. In Chapter 1, we motivate this exploration in more detail and describe the challenges that come with the collection of big data from spectroscopic surveys. In Chapter 2, we introduce the large-scale spectroscopic `Galactic Archaeology with HERMES' (GALAH) survey, whose spectra were analysed in the course of this Thesis in order to estimate stellar properties. The very large data flow of stellar surveys has been referred to as the industrial revolution of Galactic archaeology and the analysis requires new efficient and automated techniques. This Thesis describes the spectroscopic analyses of the more than 650,000 stars in the GALAH survey, which deliver up to 30 abundances with unprecedented accuracy on such scales, based on the papers by Buder et al. (2018) and Buder et al. (in prep. b). In Chapter 3, we use the chemical information from GALAH together with dynamical information and stellar ages to analyse the Galactic disk in the solar neighborhood, which has shown to be assembled from two populations. This work is published by Buder et al. (2019) and we find that the two populations of the disk can be separated more clearly when using stellar chemical composition and age, rather than phase-space information. In Chapter 4, we use chemodynamic information and stellar ages to analyse the transition between the disk and halo. This work will be submitted by Buder et al. (in prep. a) and we confirm that the old disk overlaps significantly w…
date: 2019
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (PDF)
has document: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (Other)
subject: 520 Astronomie

Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (PDF)
type: Document
has file: PhD_Thesis_SvenBuder_PDF.pdf
has part: PhD_Thesis_SvenBuder_PDF.pdf

Sven Buder
type: Person
given name: Sven
family name: Buder

Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (Other)
type: Document
is version of: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (PDF)
is volatile version of: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (PDF)
is index codes version of: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys (PDF)
has file: indexcodes.txt
has part: indexcodes.txt

HTML Summary of #26860 Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys
format: text/html
primary topic: Spectroscopic Analysis and Chemodynamic Exploration of the Milky Way with Million-Star Surveys

520 Astronomie
type: Concept
preferred label: 520 Astronomy and allied sciences @en