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.
Results
Showing 1 to 11 of 11 for “"asteroseismology"”.
-
Asteroseismology from the main sequence to giant stars
The thesis focuses on the use of asteroseismology to probe the structure of stellar sources. By observing pulsational variability, a detailed description of the interior of stars, and the determination of stellar parameters can be obtained. An extensive sample of bright K and M class giant stars …
-
Disentangling the chemodynamical history of the Milky Way disc with asteroseismology and spectroscopy
Galaxies are among the most complex systems that can currently be modelled with a computer. A realistic simulation must take into account cosmology and gravitation as well as effects of plasma, nuclear, and particle physics that occur on very different time, length, and energy scales. The Milky Way …
-
A frequency analysis of the rapidly oscillating Ap star HD 101065
… a large number of normal modes has given rise to asteroseismology, a new approach which promises to yield accurate knowledge of the interior structure and dynamics of these stars. Although the techniques of asteroseismology have yet to be perfected, they will provide us with extremely powerful …
-
Pulsations in the white dwarf primary of a cataclysmic variable star
The field of Asteroseismology provides powerful techniques for the study of pulsating white dwarf stars. If these techniques could be applied to the white dwarf primaries of Cataclysmic Variable stars, the study of accretion in interacting binary systems would benefit enormously. Our understanding …
-
Asteroseismic Study of the Subgiant HD 82074
… subgiant star, using ground-based asteroseismology with the CHIRON spectrometer at the Cerro Tololo Inter-American Observatory (CTIO) and interferometry with the CHARA array on Mt. Wilson. The physical parameters of subgiant stars are of particular interest in the exoplanetary field …
-
Investigating the A-type stars using Kepler data
… are potential planet hosts. This, and the use of asteroseismology to study their interiors, are two excellent reasons to adopt them as prime targets for detailed investigation with Kepler. Pulsation is a common phenomenon in A stars. The δ Sct stars receive wide attention but the fraction of stars …
-
Investigating the Relationship Between Chemical Abundance Ratios and Ages in Red Giant Stars
… have enabled the large-scale usage of asteroseismology for measurement of stellar masses, hence ages, at a high level of precision and accuracy for red giants, thanks to the exquisite photometry from space-based observatories. In this work, we combine the chronological information made …
-
Investigating the Relationship Between Chemical Abundance Ratios and Ages in Red Giant Stars
… have enabled the large-scale usage of asteroseismology for measurement of stellar masses, hence ages, at a high level of precision and accuracy for red giants, thanks to the exquisite photometry from space-based observatories. In this work, we combine the chronological information made …
-
The Effect of Tidal Interactions On Hot Subdwarf B Stars and Their Pulsations
Hot subdwarf B (sdB) stars are evolved core He-burning stars. The sdBs are formed by binary interactions on the red giant branch (RGB) which cause the stars to lose most of their H envelopes. Over half of all observed hot subdwarf B stars are found in binaries, many of which are found in close …
-
Magnetic fields and stellar oscillations
Stars are fluid bodies in which pressure, buoyancy, rotation and magnetism provide the restoring forces for wave propagation. Constructive interference of these waves generates global modes of oscillation. With sufficiently precise photometry, stellar oscillations can be detected through the …
-
Tidal Dissipation in Extrasolar Planets
Many known extra-solar giant planets lie close to their host stars. Around 60 have their semi-major axes smaller than 0.05 AU. In contrast to planets further out, the vast majority of these close-in planets have low eccentricity orbits. This suggests that their orbits have been circularized likely …