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 7 of 7 for “"close binaries"”.
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High-resolution spectroscopy of very active solar-type stars
… Although two of these stars may be close binaries, it is likely that eleven are single stars or wide binaries, of which four seem to be Pleiades age and two others appear Hyades age. It is usually expected that young stars are to be found in clusters, such as the Pleiades, in which …
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Gravitational waves as direct probes of binary evolution and astrophysical environments
… 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 insufficient for bringing …
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Exploring the Environment of Young Stars: Disks, Companions and Clusters
… and the NACO/VLT instrument we probe one of the closest circumstellar disks in the planet-forming age at scales of our inner Solar System. 2. Our adaptive optics survey discovers six companion candidates to young stars. The most interesting one is close to the well-known outburst star FU Ori and …
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The impact of environment on the evolution of protoplanetary discs
… with all stars being born in multiple systems. Close binaries (with orbital separation < 40AU) are likely associated to a circumbinary disc, which can be misaligned to the binary plane. Such misalignment leads to a warped structure of the disc. In this thesis, I show that warp evolution in …
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A survey of cataclysmic variables from the Edinburgh-Cape Blue object survey
… in Chapters 6-10. One of the stars discovered, a close binary with large reflection effect, is a predecessor of the cataclysmic variables. Napier's (1968) method for the reflection effect in close binaries was used to model the light curve in order to solve for the physical properties of the …
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Time-Domain Astrophysics with the Transiting Exoplanet Survey Satellite
… Chapters 4 and 5 focus on pulsating stars in close binaries, and the evolutionary insights that these "tidally tilted" pulsations enable. In particular, we focus on developing models to track the amplitude and phase of these pulsations as a function of orbital phase, as well as tools to …
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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 …