Sökning: WFRF:(Bonifacio Piercarlo) >
Exploring the Chemi...
Exploring the Chemical Evolution of Globular Clusters and their Stars : Observational Constraints on Atomic Diffusion and Cluster Pollution in NGC 6752 and M4
-
- Gruyters, Pieter, 1986- (författare)
- Uppsala universitet,Observationell astrofysik
-
- Korn, Andreas (preses)
- Uppsala universitet,Observationell astrofysik
-
- Bonifacio, Piercarlo (opponent)
- Observatoire Paris-Site de Meudon, 5 Pl Jules Janssen, 92195 Meudon Cedex, France
-
(creator_code:org_t)
- ISBN 9789155490089
- Uppsala : Acta Universitatis Upsaliensis, 2014
- Engelska 91 s.
-
Serie: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 ; 1168
- Relaterad länk:
-
https://uu.diva-port... (primary) (Raw object)
-
visa fler...
-
https://uu.diva-port... (Preview)
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- Through the cosmic matter cycle, the chemical evolution of the Milky Way is imprinted in the elemental abundance patterns of late-type stars (spectral types F to K). Due to their long lifetimes ( 1 Hubble time), these stars are of particular importance when it comes to studying the build-up of elements during the early times of our Galaxy. The chemical composition of the atmospheric layers of such stars is believed to resemble the gas from which they were formed. However, recent observations in globular clusters seem to contradict this assumption. The observations indicate that processes are at work that alter the surface compositions in these stars. The combined effect of processes responsible for an exchange of material between the stellar interior and atmosphere during the main sequence lifetime of the star, is referred to as atomic diffusion. Yet, the extent to which these processes alter surface abundances is still debated.By comparing abundances in unevolved and evolved stars all drawn from the same stellar population, any surface abundance anomalies can be traced. The anomalies, if found, can be compared to theoretical predictions from stellar structure models including atomic diffusion. Globular clusters provide stellar populations suitable to conduct such a comparison. In this thesis, the results of three independent analyses of two globular clusters, NGC 6752 and M4, at different metallicities are presented. The comparison between observations and models yields constraints on the models and finally a better understanding of the physical processes at work inside stars.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: abundances – stars: atmospheres – stars: fundamental parameters – globular clusters: individual: NGC 6752 and M4 – techniques: spectroscopic
- Astronomy with specialization in Astrophysics
- Astronomi med intiktning mot astrofysik
Publikations- och innehållstyp
- vet (ämneskategori)
- dok (ämneskategori)
Hitta via bibliotek
Till lärosätets databas