A study of the mass loss rates of symbiotic star systems

The amount of mass loss in symbiotic systems is investigated, specifically mass loss via the formation of jets in R Aquarii (R Aqr). The jets in R Aqr have been observed in the X-ray by Chandra over a four year time period. The jet changes on times scales of a year and new outflows have been observed. Understanding the amount of mass and the frequency of ejection further constrain the ability of the white dwarf in the system to accrete enough mass to become a Type 1a supernova progenitor. The details of multi-wavelength studies, such as speed, density and spatial extent of the jets will be discussed in order to understand the mass balance in the binary system. We examine other symbiotic systems to determine trends in mass loss in this class of objects.Comment: To be published in the proceedings of "The Multicoloured Landscape of Compact Objects and their Explosive Origins

Extragalactic H 2 regions in the UV: Implications for primeval galaxies and quasars

Three extragalactic regions of rapid star formation with red shifts great enough to separate the L alpha region from geocoronal L alpha were observed with the IUE satellite. Only the low metal abundance object had detectable L alpha emission. L alpha is therefore expected to be weak or absent in collapsed primeval galaxies. The detected object has a L alpha H beta identical to that of quasars

Field Ion Microscopy and Atom-Probe Mass Spectroscopy: Techniques and Selected Applications

The techniques of field ion microscopy and atom-probe mass spectroscopy are reviewed with emphasis on the general operational principles of the instruments and selected applications in the area of surface science. The single atom imaging capability of the field ion microscope is shown to make it uniquely suited to the study of detailed, atomic processes on clean metal surfaces. As examples, investigations of single-atom surface diffusion, cluster nucleation, and surface reconstructions are discussed. The ability of the atom-probe mass spectrometer to determine the chemical identity of selected atoms observed in the field ion microscope image is shown to be useful for the microanalysis of various materials. The different types of atom-probes currently in use and their application in the areas of surface catalyzed reactions and high-temperature ceramic superconductors are described

Literary Aesthetics in Oral Art

Symposium: Rules for Art in Oral TraditionProceedings from the 1988 Modern Language Association sectio

Bilayer Quantum Hall Systems at nuT = 1: Coulomb Drag and the Transition from Weak to Strong Interlayer Coupling

Measurements revealing anomalously large frictional drag at the transition between the weakly and strongly coupled regimes of a bilayer two-dimensional electron system at total Landau level filling factor nuT = 1 are reported. This result suggests the existence of fluctuations, either static or dynamic, near the phase boundary separating the quantized Hall state at small layer separations from the compressible state at larger separations. Interestingly, the anomalies in drag seem to persist to larger layer separations than does interlayer phase coherence as detected in tunneling

Double layer two-dimensional electron systems: Probing the transition from weak to strong coupling with Coulomb drag

Frictional drag measurements revealing anomalously large dissipation at the transition between the weakly- and strongly-coupled regimes of a bilayer two-dimensional electron system at total Landau level filling factor $\nu_T =1$ are reported. This result suggests the existence of fluctuations, either static or dynamic, near the phase boundary separating the quantized Hall state at small layer separations from the compressible state at larger separations. Interestingly, the anomalies in drag seem to persist to larger layer separations than does interlayer phase coherence as detected in tunneling.Comment: 4 pages, 4 figure