eprintid: 35387
rev_number: 14
eprint_status: archive
userid: 8427
dir: disk0/00/03/53/87
datestamp: 2024-09-27 07:47:02
lastmod: 2024-09-27 09:11:55
status_changed: 2024-09-27 07:47:02
type: doctoralThesis
metadata_visibility: show
creators_name: Xylakis-Dornbusch, Theodora
title: Investigation of the Galactic chemical enrichment history with searches for and chemical abundance analysis of metal-poor stars
subjects: ddc-520
divisions: i-130001
adv_faculty: af-13
abstract: This PhD dissertation presents a method for the identification of metal-poor stars with Gaia BP/RP spectra. The metal-poor star selection method is based on flux ra- tios and was developed with Gaia BP/RP simulated synthetic spectra. In follow-up work the selection method was updated and applied to Gaia DR3 BP/RP spectra with E(B - V)<=1.5. Furthermore, 26 metal-poor candidates were selected for ob- servations, of which 100% had [Fe/H] < -2.0, 57% had [Fe/H] < -2.5, and 8% had [Fe/H] < -3.0. Finally, a catalog of stellar metallicities for 10 861 062 stars was assembled. Moreover, a kinematic analysis and a 1D LTE abundance analysis of limited-r stars was conducted. In addition, the lanthanide mass fractions (XLa) of all the to date known limited-r stars were calculated and compared to that of the KN AT2017gfo. The results showed that the abundance patterns of the neutron-capture elements of limited-r stars are different depending on whether [Ba/Eu] is below or above -0.3. Also, the XLa of the KN was found to be higher than the XLa’s of the limited-r stars and in the transition region between the latter and the XLa’s of the r-I and r-II stars. Finally, the current sample of limited-r stars is largely born in the Galaxy rather than being accreted.
date: 2024
id_scheme: DOI
id_number: 10.11588/heidok.00035387
ppn_swb: 1903585694
own_urn: urn:nbn:de:bsz:16-heidok-353871
date_accepted: 2024-07-09
advisor: HASH(0x55e83b02b530)
language: eng
bibsort: XYLAKISDORINVESTIGAT
full_text_status: public
place_of_pub: Heidelberg
citation:   Xylakis-Dornbusch, Theodora  (2024) Investigation of the Galactic chemical enrichment history with searches for and chemical abundance analysis of metal-poor stars.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/35387/1/PhDThesis_Xylakis.pdf