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 25 for “"Star Cluster"”.
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Star Cluster Formation Efficiency in the Andromeda Galaxy
This work revolutionizes the study of star clusters in the Local Group galaxy Andromeda (Messier 31) using high spatial resolution, multi-wavelength imaging from the Hubble Space Telescope obtained as part of the Panchromatic Hubble Andromeda Treasury (PHAT) survey. I construct a cluster catalog …
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The impact of star cluster environments on planet formation
It is thought that most stars, including our Sun, form within clusters alongside many other stars. Planet formation and star formation occur simultaneously, and therefore the birth environment of stars will shape the formation of planets. Properties of the present day Solar System hint to a past in …
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A study of the galactic star cluster NGC 2547
The following thesis has been undertaken primarily as an observational study. Accordingly, theoretical discussion and speculations have been kept to a minimum, formulas in most case being early quoted and references given for their derivations. Since the observational techniques used are nearly all …
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Star Cluster Formation and Galactic Assembly: from instrumentation, to observations and simulations
Globular clusters (GCs) lie at the intersection of many fields, serving as test beds for stellar evolution, dynamics, and chemical evolution and acting as tracers of Galactic evolution. Despite their prevalence across astrophysics, many fundamental questions remain. Specifically, how did GCs form …
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Star Cluster Formation and Galactic Assembly: from instrumentation, to observations and simulations
Globular clusters (GCs) lie at the intersection of many fields, serving as test beds for stellar evolution, dynamics, and chemical evolution and acting as tracers of Galactic evolution. Despite their prevalence across astrophysics, many fundamental questions remain. Specifically, how did GCs form …
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Super star cluster candidates in the star-forming regions of luminous infrared galaxies
We report on a study of super star cluster (SSC) candidates in the star-forming regions of a representative sample of local luminous infrared galaxies (LIRGs) using KS-band near-infrared (NIR) adaptive optics imaging with GEMINI/ALTAIR and VLT/NACO instruments. The evolution of the cosmic star …
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Made-to-measure Modelling of Nuclear Star Clusters
The nuclear star clusters of late-type spiral galaxies are comprised of multiple components. Gemini near-infrared spectroscopy of the nuclear star cluster in NGC 4244 shows clear rotation. Earlier, De Lorenzi et al. (2013) constructed two component (disc + spheroid) axisymmetric three integral …
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Search for Ultra-faint Milky Way Satellites
… companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1–3. Pegasus III is an ultra-faint outer halo dwarf satellite in the constellation of …
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Search for Ultra-faint Milky Way Satellites
… companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1–3. Pegasus III is an ultra-faint outer halo dwarf satellite in the constellation of …
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Surfing the Bar to the Solar Circle
<p>This thesis studies a process by which a star cluster could migrate to its current position while its stellar members maintain their stable orbits by surfing the stable Lagrange points of a growing and slowing bar. NGC 6791 is a massive metal-rich open cluster in the Milky Way located within the …
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The accuracy of integrated star clusters parameters. The effects of stochasticity /
Star clusters are important tools to probe the star formation history in their host galaxy. The physical parameters (age, mass, extinction, and metallicity) of star clusters with integrated broad-band photometry are traditionally derived using the Simple Stellar Population models (SSP). However, …
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Integralinių žvaigždžių spiečių parametrų tikslumas. Stochastiniai efektai /
Star clusters are important tools to probe the star formation history in their host galaxy. The physical parameters (age, mass, extinction, and metallicity) of star clusters with integrated broad-band photometry are traditionally derived using the Simple Stellar Population models (SSP). However, …
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Masses of globular clusters
… dispersions have been derived for 10 globular clusters from high dispersion (6.7A mm-1) coude spectra of the integrated light. Two methods were used. The first involved the comparison of the cluster spectra with star spectra convolved with an appropriate velocity distribution function. This is …
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Masses of globular clusters
… dispersions have been derived for 10 globular clusters from high dispersion (6.7A mm-1) coude spectra of the integrated light. Two methods were used. The first involved the comparison of the cluster spectra with star spectra convolved with an appropriate velocity distribution function. This is …
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Models of Dust and Gas Tori in Active Galactic Nuclei
… simulations to trace the evolution of a nuclear star cluster, which provides energy via discrete supernova explosions and mass from stellar mass loss. With these ingredients, a highly dynamical system forms, with gas streaming inward, in form of long filaments, which cool due to radiative energy …
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Modelling interstellar extinction in stellar populations
… 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 stellar populations. The treatment of extinction in standard CMD analyses is to employ constant ratios of extinction …
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Analyzing Spectra of Type Iin Supernovae and their Host Environments To Determine If Some Arise From Runaway Progenitors
… km/s or greater may imply a runaway progenitor star, ejected via dynamical interaction or as the mass-gaining companion of a binary star system where the primary explodes first. Signicant fractions of runaway progenitors would have an impact on our understanding of the progenitors of SNe IIn, …
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Star Formation in OB Associations and Clusters
Star formation can be characterized at two levels: at microscopic level by the initial mass function (IMF), and at macroscopic level by space, time, and intensity. To understand how star formation proceeds across a region, all four parameters need to be examined. We used the resolved massive stars …
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Constraining the Origin of Multiple Stellar Populations in Stellar Clusters
Globular clusters were among the first luminous objects to form in the Universe. They are dense collections of hundreds of thousands of stars. Globular cluster formation is a major unsolved problem in astrophysics. A new constraint on the problem came from the discovery of unexpected star-to-star …
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Properties of turbulent star-forming clusters : models versus observations
Stars are born in turbulent molecular clouds that fragment and collapse under the influence of their own gravity, forming a cluster of hundred or more stars. The star formation process is controlled by the interplay between supersonic turbulence and gravity. In this work, the properties of stellar …
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