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Showing 1 to 17 of 17 for “"Spectropolarimetry"”.
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SALT spectropolarimetry commissioning
The large (10m) aperture of the Southern African Large Telescope (SALT) coupled with the unique capabilities of the Robert Stobie Spectrograph (RSS), promises unparalleled prospects for polarimetric observations on an 8 - 10 m class telescope. RSS is a complex and highly versatile first-generation …
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Spectropolarimetry of epsilon Aurigae: Probing Stellar and Disk Atmospheres
<p>The bright eclipsing binary system epsilon Aurigae offers a unique opportunity to uncover physical mechanisms contributing to disk formation and evolution and to explore the relationship between photospheric anisotropies, stellar pulsation and mass loss. This research contributes to our …
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Wideband spectropolarimetry of extragalactic radio sources with KAT 7 and commissioning phase MeerKAT
The study of cosmic magnetism is vital in fully understanding the role that magnetic fields play in the evolution of cosmological objects such as galaxies. The exact role played by magnetism in galaxy evolution is still not fully understood. This work aims to use wide band radio polarimetry to …
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High resolution linear spectropolarimetry: a study of the potentiality in probing stellar atmospheres and circumstellar environments
… particular, in a stellar context high resolution spectropolarimetry can potentially: (i) investigate the physics of the shaping mechanisms of the protoplanetary nebulae (PNe) and the possible interaction between the central star and the very close surrounding, (ii) investigate stellar photospheric …
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A New Era of Observational Capability at Ritter Observatory: Spectropolarimetry from Exoplanets to Circumstellar Disks and Beyond
We undertook efforts to restore and relocate the University of Wisconsin's Halfwave-Polarimeter (HPOL) spectropolarimeter to the University of Toledo's Ritter Observatory. This process required fairly extensive work to the optical-mechanical alignment of the Ritter Observatory 1-meter telescope. …
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Development of a Single-Crystal X-ray Spectropolarimeter and Application to Wire-Array Z-pinches
… emitted radiation, polarization spectroscopy, or spectropolarimetry, can be used to diagnose these environments. Spectropolarimetry in the x-ray spectral range extends the applicability of this technique to highly anisotropic high energy density plasmas. X-ray spectropolarimetry is typically …
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Differential polarization of Hβ in γ CAS
High resolution ( 0.15 Å/pixel ) spectropolarimetry across the Hβ emission line of the Be star γ Cas is presented. The differential polarization and polarization angle vary both in profile and depth. It was found that the polarization profile fits the relation PL, = (Iunderlying / Itotal)Pc, …
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Theoretical and Experimental Studies of Radiation from High-Z Multiply Ionized L-shell Ions with Emphasis on X-ray Line Polarization
… for HED plasma spectroscopy and x-ray line spectropolarimetry. The X-pinch experimental data are produced on the Nevada Terawatt Facility (NTF) Zebra generator at the University of Nevada, Reno. Spectroscopic analysis reveals the existence of two distinct plasma radiation sources, one which …
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Accretion processes in magnetic cataclysmic variables - a detailed study of UZ Fornacis
… The optical data include SALT circular spectropolarimetry taken around the eclipse and SHOC and MeerLICHT photometry. The total intensity spectrum shows broad emission features with the continuum that rises in the blue. The percentage circularly polarized spectra show that UZ For is …
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Theoretical Studies of L-shell X-ray Line Polarization and M-shell X-ray Spectroscopic Emission from Highly Ionized Xenon Ions
… radiation sources. X-ray plasma spectroscopy and spectropolarimetry are integral to the study of HED plasmas. Comparison of x-ray line emission spectra to non-local thermodynamic equilibrium (non-LTE) modeling and inclusion of non-thermal effects provides insights to laboratory-produced plasmas …
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Polarimetric observations at low radio frequencies
… These fields can be studied through wide-field spectropolarimetry, which allows for faint polarised signals to be detected at relatively low radio frequencies. An interferometric polarisation mode has recently become available at the Giant Metrewave Radio Telescope (GMRT). A detailed analysis of …
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Probing the Role of Nascent Helicity in Protein Function: p27kip1 as a Regulator of the Cell Cycle
… mutants were characterized by circular dichroism spectropolarimetry (CD). Thermal denaturation experiments showed that the ternary complexes of the p27 variants bound to Cdk2/cyclin A were less stable compared to the ternary complex formed by wild- type p27(p27-KID<sup>wt</sup>). Thermodynamic …
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Optical Spectroscopy Analysis of the Physicochemical Properties of Poly(3-Hexylthiophene) (P3Ht) Solutions Using Various Solvents Towards Controllable Formation of Polymeric Aggregates.
The understanding of aggregates formed by conjugated polymers is of fundamental importance to consolidate them in the scenario of novel materials for organic technologies. Polymeric aggregates manifest themselves in H- and J-types or in a combination of them, such as HJ-types, and optical …
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High resolution spectropolarimetric diagnostics of weak, small-scale magnetic fields in the solar photosphere
It has been known for some time that there exists a substantial amount of ‘hidden’ magnetic energy in the quiet solar photosphere, and unlocking an understanding of this phenomenon requires the study of magnetic activity on the smallest scales accessible to observations. With the advent of next …
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Analisi spettropolarimetriche delle linee fotosferiche e cromosferiche acquisite durante brillamenti solari.
In questa tesi di dottorato, ho indagato le dinamiche complesse dei brillamenti (flare) solari, concentrandomi in particolare sul brillamento di classe X1.6 avvenuto nella regione attiva NOAA 12192 il 22 ottobre 2014. Utilizzando i dati dell'Interferometric Bidimensional Spectropolarimeter (IBIS), …