eprintid: 18256
rev_number: 17
eprint_status: archive
userid: 1678
dir: disk0/00/01/82/56
datestamp: 2015-03-09 13:56:29
lastmod: 2015-04-27 11:00:24
status_changed: 2015-03-09 13:56:29
type: doctoralThesis
metadata_visibility: show
creators_name: Kacharov, Nikolay M.
title: Chemical abundances and kinematic properties
of Galactic globular clusters
subjects: 520
divisions: 130001
divisions: 130200
divisions: 130300
divisions: 130500
divisions: 130700
adv_faculty: af-13
abstract: High-resolution spectroscopic studies of globular clusters (GC) have been a major break-through
in our understanding of these ancient stellar systems. The observations carried out in the last decade
revealed a very heterogeneous population of objects – not only have GCs undergone a complex
star formation history resulting in large chemical inhomogeneities common amongst all of them,
but there are also non-negligible cluster-to-cluster differences in both chemistry and kinematics that
are not yet fully understood. In this thesis, we present the first ever high-resolution studies of two
poorly known GCs M75 and NGC4372. M75 is a massive, relatively metal-rich, outer halo GC
with extremely broad horizontal branch. We found that, besides the typical light-element variations,
it shows a marginal spread in metallicity and likely has a small s-process rich population. Surprisingly
for its metallicity, the majority of the analysed stars lack s-process enrichment, which hints
to a formation in an environment that built metals very quickly. On the other hand, NGC4372 is
one of the most metal-poor GCs in the Galaxy. It is found in the inner halo and has experienced
multiple disk crossings. The chemical analysis revealed it as a standard representative of the old,
metal-poor halo group. More interesting are its structural and kinematic properties as the cluster
has an unusually high intrinsic rotation for its metallicity and appears to be rotationally flattened.
Furthermore, since GCs trace the chemical properties of their environment, the thesis also includes
the first homogeneous study of the Galactic halo evolution of the poorly studied a element sulphur
traced by GC stars covering a large metallicity span.
date: 2015
id_scheme: DOI
id_number: 10.11588/heidok.00018256
ppn_swb: 1656159074
own_urn: urn:nbn:de:bsz:16-heidok-182560
date_accepted: 2015-02-04
advisor: HASH(0x564e1c4147e0)
language: eng
bibsort: KACHAROVNICHEMICALAB2015
full_text_status: public
citation:   Kacharov, Nikolay M.  (2015) Chemical abundances and kinematic properties of Galactic globular clusters.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/18256/1/Kacharov_PhD_thesis.pdf