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 210 for “"low mass"”.
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Magnetic braking in low-mass stars
Low-mass stars with masses below about 1.3 solar masses exhibit intriguing trends in the evolution of their spins. These stars also exist in tidally locked binaries with a white dwarf (WD) companion, the cataclysmic variables (CVs). Their orbital evolution is driven by angular momentum loss due to …
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Formation of Low-Mass X-Ray Binaries
… study of the origin and properties of low-mass X-ray binaries (compact objects with Roche-lobe filling low-mass companions) by means of population syntheses is presented. A semi-analytical synthesis method that offers major advantages in terms of statistical accuracy and computational …
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Activity and kinematics of low mass stars
We present an analysis of the magnetic activity, photometry and kinematics of approximately 70000 M dwarfs from the Sloan digital Sky Survey (SDSS) Data Release 7. This new analysis explores the spatial distribution of these M dwarf properties as a function of vertical distance from the Galactic …
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X-ray spectroscopy of low-mass X-ray binaries
… X-ray grating spectroscopy of neutron stars in low-mass X-ray binaries (LMXBs) using instruments onboard the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission (XMM-Newton). The first part of this thesis concentrates on results from the subset of LMXBs with orbital periods less than an …
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Investigating the Low-Mass Stellar Initial Mass Function in Draco
We present new analysis of the low-mass stellar initial mass function ($\sim0.4-0.8M_\odot$) in the Local Group dwarf spheroidal galaxy, Draco. Using archival HST/ACS and WFC3 optical imaging, we construct deep color-magnitude (CMD) diagrams in 3 different felds at 3 different galactocentric radii …
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The First Laboratory Searches for Low-Mass Axion Dark Matter
… ‘dark’. The dark matter is likely comprised of massive particles that interact very little or not at all with other matter. Despite this lack of interaction, the ubiquity of dark matter has allowed it to have profound effects on the history of our universe—including seeding the formation of …
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AN OBSERVATIONAL STUDY OF LOW-MASS STAR FORMATION IN NGC 2264
… yield magnitudes for a set of candidate low-mass cluster members. Using the photographic plates and a supplementary video camera Hα survey, these candidates are selected on the basis of their exhibiting significant Hα emission, large amplitude variability, or anomalously blue colors. To …
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The accretion process in neutron-star low-mass X-ray binaries
… studies of accreting neutron stars (NSs) in low-mass X-ray binaries involving the X-ray spectral decomposition, the relations between subtypes (mainly atoll and Z sources), and the origins of different X- ray states. Atoll sources are less luminous and have both hard and soft spectral states, …
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X-ray spectroscopy of neutron star low-mass X-ray binaries
… a variety of topics relating to neutron star lowmass X-ray binaries (LMXBs) and utilize spectral information from X-ray observations to further our understanding of these sources. First, I give an overview of important X- ray astrophysics relevant to the work I present in subsequent chapters, …
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Studying the Building Blocks of the Universe: the faint, low-mass galaxies
Faint, low-mass galaxies are the next frontier in extending our understanding of how our universe evolved into its present-day state that we observe. As the ever-advancing technological prowess brings about the next generation of cutting-edge observational facilities, the limit down to which we can …
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Investigating bursty star formation and interstellar medium conditions in low-mass galaxies
Low-mass galaxies or dwarf galaxies (galaxies with stellar massM∗<10⁹ᐧ⁵.5M⊙) are the most abundant systems in the universe, and are the progenitors of present-day Milky Way-mass galaxies. Compared to massive galaxies, low-mass galaxies exhibit higher specific star formation rates (sSFR), and have …
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Accretion flows and neutron star heating in low-mass X-ray binaries
… test beds for studies of high-energy accretion flows and the properties of compact objects. Neutron star (NS) low-mass X-ray binaries (LMXBs) vary in brightness by almost 8 orders of magnitude and are hosts to diverse accretion flows, transporting varying amounts of energy and mass toward the …
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Searching for exotic Higgs boson decays using a low mass double b-tagger
… Model or “exotic” Higgs decays to about < 26%. Allowing the Higgs to decay into new particles could remedy some outstanding problems in the Standard Model like dark matter or the matter/anti-matter asymmetry in the universe. Thus, an exciting window of opportunity exists for new physics. The …
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Rotation Period Distributions and Light Curve Morphologies of Low Mass Stars and Young Associations
… is centered around the rotation periods of low-mass stars and association of young stars. Rotation periods are a link to the age of the star, as they lose angular momentum over time. To understand how this angular momentum evolves requires understanding the rotation period distributions of a …
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The environmental impact of high- and low-mass stars: from formation to main sequence
… clouds, and (2) the effects of radiation from massive stars. We first compare polarization measurements of 52 Galactic star-forming regions with their locations in the Galaxy. In particular, we find that there is no correlation between the average magnetic field direction of star-forming …
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Design of a low-mass high-torque brushless motor for application in quadruped robotics
… motors used to power the robot, as well as the mass and power dissipation of these motors. These limitations formulate the need for a lowmass high-torque low-loss motor. This thesis outlines the process of designing a permanent-magnet synchronous motor that meet the goals of the robot while …
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A multiwavelength analysis of M31's globular clusters and their low mass X-ray binaries
… analysis of M31’s globular clusters and their low mass X-ray binaries by Mark B. Peacock Globular clusters (GCs) are dense groups of thousands to millions of stars. They are often very old systems with ages similar to those of their host galaxies and the early Universe. These clusters provide …
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Spectral Comparisons of Neutron Star Low-Mass X-Ray Binaries with Black Hole X-Ray Binaries
… of high-resolution X-ray spectra of neutron star low-mass X-ray binaries (LMXBs) allows the investigation of the innermost parts of the accretion disk and immediate surroundings of the compact object. The weak magnetic eld of old neutron stars present in such systems allows the accretion disk to …
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A Search For New Low-Mass Diphoton Resonances At Atlas And An Investigation Into Using Gaussian Process Regression To Model Non-Resonant Two-Photon Standard Model Backgrounds
… Next I present a search for new physics in low-mass (65-110 GeV) diphoton events. This is a model independent search that is motivated by several extensions to the Standard Model including the two Higgs doublet model where new scalars can appear as lighter versions of the Standard Model …
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