Browsing Department of Physics, Engineering Physics and Astronomy Graduate Theses by Author "Wade, Gregg"
Now showing items 1-11 of 11
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Constraining the Limits of the Magnetic Confinement-Rotation Diagram: An Analysis of Two B-type Systems Hosting Recently Discovered Extreme Centrifugal Magnetospheres
Sikora, James (2015-12-01)Following the detection in the late 70s of a strong magnetic field in the early B-type star sigma Ori E and, more recently with the results of the Magnetism In MassivE Stars (MiMeS) survey, an important and rare subclass ... -
A detailed observational analysis of magnetism in three B and O stars observed within the context of the MiMeS project
Grunhut, Jason (2012-09-28)The detailed observational analysis of three massive B- and O-type stars was carried out in this study in order to characterize their fundamental, magnetic, and variability properties. The bulk of the data acquired were ... -
Investigating the potential magnetic origin of wind variability in OB stars
David-Uraz, Alexandre (2016-05-24)In this thesis, the origin of large-scale structures in hot star winds, believed to be responsible for the presence of discrete absorption components (DACs) in the absorption troughs of ultraviolet resonance lines, is ... -
Magnetic fields and the variable wind of the early-type supergiant β Ori
Shultz, Matthew Eric (2012-04-30)Supergiant stars of spectral types B and A are characterized by variable and structured winds, as revealed by variability of optical and ultraviolet spectral lines. Non- radial pulsations and magnetically supported loops ... -
The Magnetic Fields of Ap Stars From High Resolution Stokes IQUV Spectropolarimetry
Silvester, James (2014-05-28)In this thesis we describe the acquisition of high resolution time resolved spectropolarimetric observations of 7 (bright and well understood) Ap stars in Stokes IQUV using the ESPaDOnS and Narval spectropolarimeters at ... -
Magnetic, chemical and rotational properties of the Herbig Ae/Be binary system HD 72106
Folsom, Colin Peter (2007-09-17)Recently, magnetic fields have been detected in a handful of pre-main sequence Herbig Ae and Be (HAeBe) stars. This hints at an evolutionary connection between magnetic HAeBe stars and Ap and Bp stars. Ap/Bp stars are ... -
On an Emerging Paradigm of Tepid Stars: Assessing the Magnetic Desert and the Magnetic Origin of Surprisingly Common Star Spots
Sikora, JamesThe past decade has seen several significant shifts in the field of stellar magnetism, particularly on the observational front. A new generation of dramatically more efficient, high-resolution spectropolarimetric instruments ... -
Physical properties of a complete volume-limited sample of Ap/Bp stars: Magnetic. rotational, multiplicity, and evolutionary properties of magnetic intermediate-mass stars within 100 pc of the sun
Power, Jennifer (2007-09-27)The population of all magnetic chemically peculiar stars (Ap stars) within 100 parsecs of the sun has been identified and investigated, determining fundamental parameters, rotational properties, and magnetic field ... -
The role of surface fossil magnetic fields in massive star evolution
Keszthelyi, ZsoltModels describing the evolution of massive stars have advanced significantly due to understanding and including key physical phenomena in the calculations, such as mass loss and rotation. As stellar magnetometry has ... -
The Rotational Evolution and Magnetospheric Emission of the Magnetic Early B-type Stars
Shultz, Matthew (2016-08-05)How do the magnetic fields of massive stars evolve over time? Are their gyrochronological ages consistent with ages inferred from evolutionary tracks? Why do most stars predicted to host Centrifugal Magnetospheres (CMs) ... -
Using High-Resolution Spectroscopy To Improve The Determination Of Effective Temperatures OF Pre-Main Sequence Stars
Grunhut, Jason (2009-02-17)Herbig Ae/Be (HAeBe) stars are the pre-main sequence progenitors of main sequence A and B stars, and are characterized observationally by strong emission in spectral lines and significant infra-red excess that results from ...