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 13 of 13 for “"Binary evolution"”.
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Binary evolution in stellar dynamics
… to establish what role they play in the evolution of a system. Many wide pairs are to be expected, and theoretical results on their properties, such as the distribution of eccentricities, are confirmed by the results of numerical experiments, but their dynamical importance is slight. …
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Gravitational waves as direct probes of binary evolution and astrophysical environments
… of a merging heavy stellar-mass black-hole binary. Many such compact binaries have been detected since then and more massive black-hole mergers are expected to be detected as the rest of the gravitational-wave spectrum is opened up in the coming years and decades. Gravity itself, however, is …
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Gravitational Wave prediction from Galactic binary populations for LISA
… an opportunity to unravel critical details about binary star evolution and the broader history of the Milky Way. Using results from the Binary Population and Spectral Synthesis (BPASS) code combined with a Milky Way analogue based on the Feedback in Realistic Environments (FIRE) simulations,we …
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Full-Stack Change Management for Database Systems
… changes. Two primary external factors drive this evolution. On the one hand, database vendors release new versions of the database software, introducing new features, bug fixes, and security patches, resulting in the ongoing evolution of the database binary. On the other hand, developers modify …
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Be binary stars with hot, compact companions
In this study the importance of close binary evolution for Be star formation was investigated. The Be star 59 Cygni was confirmed to be an evolved binary with a sdO companion. The companion was confirmed by a weak helium II absorption. Orbital elements and stellar masses were determined. In the …
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Multi-wavelength study of neutron stars in the Magellanic Clouds
Massive stars are essential drivers of galaxy evolution, as well as the synthesis of heavier elements, enriching the interstellar and intergalactic medium with metals through every cycle of star formation. Thus to understand the evolving universe, it is essential to quantify the formation and …
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Observational and evolutionary studies of neutron star X-ray binaries
In this thesis, we present our observational and evolutionary studies of neutron stars in X-ray binary systems. A variety of topics are discussed, which are all related by a single scientific theme, namely, helping to set constraints on the mass-radius relation of neutron stars, and hence on their …
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Cosmological Simulations with Resolved Supermassive Black Hole Binary Dynamics and Accretion
… and improvements for galaxy formation and evolution models by enabling direct comparisons with observations. For reliable results, simulated galaxies must resemble those in the real Universe. Here, it is found that the galaxies produced by KETJU generally follow observed relations, such as …
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Dust disks around hot white dwarfs and central stars of planetary nebulae
… formation of circumstellar dust disks through binary interactions. In addition, we have derived basic dust disk parameters using simple blackbody approximations, or optically thin dust disk models with realistic grain and disk properties. The dust disk physical parameters for CSPNs without …
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Binary pulsars: evolution and fundamental physics
… of pulsar spin-up, a neutron star (NS) in a binary system accretes matter from its companion star; this serves to transfer angular momentum to the NS, increasing the spin frequency of the pulsar. Measurement of the orbital parameters and system geometry, and in particular the final system …
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Physics in the extreme: X-ray and optical studies of magnetic white dwarfs and related objects
… from optical and X-ray studies of compact binary systems. These observations are used to constrain orbital parameters - mainly periods and inclinations for several cataclysmic variables - and examine the accretion structures within the systems. In Chapters 3 and 4, optical and X-ray studies …
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Multiwavelength studies of classical novae
… of an accreting white dwarf in interacting binary stars, namely cataclysmic variables. These eruptions and their progenitors are ideal astronomical events/objects to study a variety of interesting topics, such as mass-transfer mechanisms, binary evolution, and thermonuclear and radiative …
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Relativistic Jets from Compact Binary Mergers as Electromagnetic Counterparts to Gravitational Wave Sources
… relativistic jets that accompany the merger of binary neutron stars or black hole-neutron star systems. These counterparts provide a probe for the structure and dynamics of these relativistic outflows. Binary neutron star, or neutron star-black hole, mergers are thought to be the dominant …