We report broad-band X-ray measurements of the Be star γ Cassiopeiae by the BeppoSAX X-ray astronomy satellite. The observations took place on 1998 July, 18–23. The 0.1– 200 keV X-ray spectrum is reasonably well fit by an optically thin thermal plasma model of temperature 12.5±0.6 keV with significant residuals around 0.3 keV and 1 keV. The former is interpreted as the variable soft component r...

We developed an instrument design capable of measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics. A set of multilayer-coated ats reects the dispersed X-rays to the instrument detectors. The intensity variation with position angle is measured to determine three Stokes parameters: I, Q, and U – all as a function of energy. By laterally grading the multila...

A phenomenological model of broadband impedance containing two free parameters has been recently proposed. This paper attempts to assign physical charaterizations to these free parameters by relating them to the geometric dimensions of a stand-alone cavity structure. Contributed paper at the Broadband Impedance Measurements and ModelZing Workshop SLAC, Stanford, USA February 28 March 2, 2000 ‘W...

I briefly introduce a database of models that describe the evolution of star clusters in several broad-band photometric systems. Models are based on the latest Padova stellar evolutionary tracks – now including the α-enhanced case and improved AGB models – and a revised library of synthetic spectra from model atmospheres. As of today, we have revised isochrones in Johnson-Cousins-Glass, HST/WFP...

In this paper, properties of reflection phase in one-dimensional quaternary photonic crystals combining dispersive meta-materials and positive index materials are investigated by transfer matrix method. Two omnidirectional band gaps are located in the band structure of considered structure. However, we limit our studies to the frequency range of the second wide band gap. We observe that the val...