Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"stellar populations"”.
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Modelling interstellar extinction in stellar populations
In stellar astrophysics, the determination of the magnitude of interstellar extinction is critical, due to its effect on the observed brightness and colour of the stars. Extinction is therefore an important factor in deriving scientific information from the colour-magnitude diagrams (CMDs) of …
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Metallicities and stellar populations in spiral bulges
… with a more accurate tool for probing galaxy populations. The work in this thesis compares Lick indices in bright elliptical galaxies with those in the bulges of spiral galaxies, in an effort to compare, contrast and constrain their star formation histories. Long-slit spectroscopic …
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Kinematics and Stellar Populations in Brightest Cluster Galaxies
… cluster galaxies (BCGs), their kinematic and stellar population properties and the relationships between these and the properties of the host clusters. Some of the questions addressed are: how the kinematic and stellar population properties differ from those of ordinary giant elliptical …
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Kinematics and stellar populations of the galactic bulge.
… velocities and obtain metallicities for the stellar population of the Galactic bulge, several hundred spectra of giants have been obtained. These include three bulge fields at projected distances from the Galactic center of 1.5, 1.7 and 1.7 kpc, and 33 globular and open clusters. We measure …
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Resolved stellar populations: watching galaxy evolution in real time
… the investigation of the evolution of resolved stellar contents of nearby systems. Hence the properties of these regions represent an archaeological record of the processes that shape a galaxy over cosmic time. So one can interpret from the star formation history the evolution of the star …
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On the complex stellar populations of ancient stellar systems
The study of ancient stellar systems in the vicinity of the Milky Way provides a wealth of information on the conditions, in the early Universe, that led to the properties we observe today in galaxies and in their constituent components. Resolved stellar populations enable us to gain detailed …
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Understanding massive disk galaxy formation through resolved stellar populations
In this thesis we utilize resolved stellar populations to improve our understanding of galaxy formation and evolution. In the first part we improve a method for metallicity determination of faint old stellar systems, in the second and third part we analyze the individual history of six nearby disk …
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Constraining the Origin of Multiple Stellar Populations in Stellar Clusters
… These abundance variations (or multiple stellar populations) are ubiquitous to all globular clusters studied to date. The pursuit to explain this longstanding prob- lem using these new constraints (i.e. the abundance variations), has reinvigorated the study of globular clusters, and at …
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A panchromatic study of stellar populations in Galactic Globular Clusters
… Straggler Stars (BSS) radial distribution is in stellar clusters and (ii) which are the physical processes that can produce this bimodality. We discuss possible relations between the properties of the BSS radial distribution and the dynamical state of the hosting clusters by making use of …
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Extreme Stellar Populations in the Universe: Backsplash Dwarf Galaxies and Wandering Stars
… epoch. Sizes and properties of these combined populations should place some constraints on the orbits and masses of the progenitor objects from which they came, providing insight into the merging histories of galaxies in general and the Milky Way in particular. We distinguish between Local …
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A spectroscopic and photometric study of stellar populations in a sample of clusters in the Magellanic Clouds
… provides a rich resource for investigating stellar and chemical evolution and to obtain a detailed view of the star formation history and chemical enrichment of the Clouds. The results discussed here are based on the analysis of high-resolution photometric and spectroscopic datasets obtained …
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Rare Stellar Populations in the Magellanic Clouds: Identification of Super-Asymptotic Giant Branch Star and Yellow Supergiant Binary Candidates
… which I identify and characterize multiple new populations of massive stars in rare or elusive phases of stellar evolution---thereby demonstrating the power of large surveys and systematic observation campaigns to constrain models of massive star evolution. First, I investigate the true nature …
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The Andromeda Optical and Infrared Disk Survey
… of galaxies inform us about a galaxy’s stellar populations and interstellar medium, revealing stories of galaxy formation and evolution. How we interpret this light depends in part on our proximity to the galaxy. For nearby galaxies, detailed star formation histories can be extracted …
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The formation of enhanced, low-ionization emission in galactic halos
… is given to the spatial distributions of their stellar populations, the relative importance of nuclear continuum sources and subsequent radiative transfer. Estimation of the stellar populations in NGC 891 and the Galaxy indicates that OB stars, and the central stars of planetary nebulae dominate …
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Chemodynamical Adaptive Mesh Refinement Simulations of Disk Galaxies
… of the vertical velocity dispersion of the stellar disc where loose group galaxies tend to exhibit a greater number of instances of impulsive heating of the disc. In the second project I present further analysis of this suite of galaxies and a comparison with other galaxies simulated using …
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Luminous red galaxies in simulations
… in LRGs form at the same time, age-dating of two populations of LRGs at different redshifts can provide an estimate of the time difference associated with the corresponding redshift interval (dt/dz). This gives a direct estimate of the Hubble parameter at the average redshift of the two …
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Building galaxy models with self-consistent prescriptions for stellar and nebular emission
… meaningful astrophysical quantities relies on ``stellar population synthesis'' (SPS) models. These models include descriptions for the light produced by stars and dust in galaxies, but most neglect the nebular emission from ionized gas. Accounting for nebular emission is important, as both line …
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Stochastinė galaktikų diskų evoliucija. 2-D modeliai /
… producing synthetic colour-magnitude diagrams of stellar populations at any time and at any position in the disk. We applied our model for the simulation of star formation history in the M33 galaxy. Based on the detailed analysis of the M33 galaxy evolution, we showed that, in order to resolve the …
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Characterization of the Galactic White Dwarf Population in the Next Generation Virgo Cluster Survey
Halo white dwarfs remain one of the least studied stellar populations in the Milky Way because of their faint luminosities. Recent work has uncovered a population of hot white dwarfs which are thought to be remnants of low-mass Population II stars. This thesis uses optical data from the Next …
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