309 research outputs found
Observations and analysis of X-ray binary stars under the IUE guest observer program
IUE data for X-ray binaries were collected and analyzed. Image processing was done for 144 IUE images. The images represent 27 different objects
Imaging slitless spectrometer for X-ray astronomy
Imaging slitless spectrometer, a combination of an X ray transmission /or reflection/ grating and image-forming X ray telescope, is capable of obtaining simultaneous spatial and spectral information about celestial X ray sources
Studies and observations of ultraviolet and X-ray sources
The status of research undertaken with the IUE satellite for programs on strong binary X-ray stars and X-ray globular clusters is summarized. Variable Seyfert galaxies and cataclysmic variables were investigated
Remote sensing X-ray spectrometer
Spectrometer measures chemical composition of lunar rocks by remote sensing from orbit and senses lunar X-rays produced by interaction of solar X-rays and elements on the lunar surface. Instrument features high sensitivity, data handling system that accumulates and prepares data for telemetry, and automatic calibration
A program of X-ray astronomy from sounding rocket Final report
X-ray astronomy from sounding rocket
Results of a Sounding Rocket experiment to study celestial X-ray sources Final report
Sounding rocket experiment to study celestial X-ray source
Analysis of sounding rocket data regarding celestial X-ray sources Final report
Celestial observation, sounding rocket data, and emission spectrum used to identify Sco X-1 of Scorpio constellatio
The Energy-Momentum tensor on manifolds
On manifolds, we study the Energy-Momentum tensor associated with a
spinor field. First, we give a spinorial Gauss type formula for oriented
hypersurfaces of a manifold. Using the notion of generalized
cylinders, we derive the variationnal formula for the Dirac operator under
metric deformation and point out that the Energy-Momentum tensor appears
naturally as the second fundamental form of an isometric immersion. Finally, we
show that generalized Killing spinors for Codazzi Energy-Momentum
tensor are restrictions of parallel spinors.Comment: To appear in IJGMMP (International Journal of Geometric Methods in
Modern Physics), 22 page
Lunar surface exploration by satellite. An integrated experiment package to perform measurements of the composition of the lunar surface Final report
Integrated experiment package to measure lunar surface composition - gamma ray, alpha particle, X ray fluorescence, and neutron albedo experiment
An LDEF 2 dust instrument for discrimination between orbital debris and natural particles in near-Earth space
The characteristics of a space dust instrument which would be ideally suited to carry out near-Earth dust measurements on a possible Long Duraction Exposure Facility reflight mission (LDEF 2) is discussed. As a model for the trajectory portion of the instrument proposed for LDEF 2, the characteristics of a SPAce DUSt instrument (SPADUS) currently under development for flight on the USA ARGOS mission to measure the flux, mass, velocity, and trajectory of near-Earth dust is summarized. Since natural (cosmic) dust and man-made dust particles (orbital debris) have different velocity and trajectory distributions, they are distinguished by means of the SPADUS velocity/trajectory information. The SPADUS measurements will cover the dust mass range approximately 5 x 10(exp -12) g (2 microns diameter) to approximately 1 x 10(exp -5) g (200 microns diameter), with an expected mean error in particle trajectory of approximately 7 deg (isotropic flux). Arrays of capture cell devices positioned behind the trajectory instrumentation would provide for Earth-based chemical and isotopic analysis of captured dust. The SPADUS measurement principles, characteristics, its role in the ARGOS mission, and its application to an LDEF 2 mission are summarized
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