Types Of Cataclysmic Variables Research Articles

THE POSITRONE γ-SPECTROSCOPY OF SIMBIONIC SYSTEMS

The γ-spectroscopy of rapid processes in space and Earth atmospheres we considered in this paper. One of considered object is AM Her types cataclysmic systems in soft γ-ray spectra. We calculated intensity of annihilation line who indicates the p-p thermonuclear explosions in a surface of the White Dwarfs (therefore WD). In the presented results we used, that the p-p detonation in degenerate plasma produce positrons. We confirmed that the formed annihilation γ-quants with energy 0.511 MeV is the suitable diagnostic possibility to study the effectiveness of thermonuclear reaction channels during such explosions. These results show the reason for the lack of registration of γ- flares in other types of cataclysmic variables. For example, in this paper considered systems with classical accretion disks named how Periodical Novae. Because these explosion is rare and have specific in geometrical and physical conditions for him monitoring with other strategy of observation. In Earth atmosphere tame scale of formation of secondary positrons is same. We showed, that annihilation of positrons occurs in near Earth surface zone. In this case observatories based in height reaching 2000 and more meters are important, it is advisable to planning the placement of this kind of equipment. It is confirmed, that presented perovskite detectors have the necessary sensitivity and universal spectral sensitivity and the study and modeling of interaction processes allows you to set the operating modes of the interfaces in the monitoring modes of observations. In presented paper has been confirmed, that perovskite materials in form of binary detectors enables simultaneous observations of hard radiation and optical quanta. In this cases observation of CR, micro meteors and other rapid objects in Earth atmosphere greatly expands the possibilities of their study.

Spectropolarimetry of CV’s; Signatures of Magnetic Fields in Accretion Flows

AbstractWe present preliminary results of spectropolarimetric observations of several cataclysmic variables using the ISIS spectropolarimeter on the 4.2m William Hershell Telescope at La Palma. Our aim is to look for Zeeman signatures of magnetic fields in cataclysmic variables. This would provide a direct measurement of magnetic fields in the accretion flows of CVs. Our current dataset allows us to set upper limits to the presence of magnetic fields and constrain the field geometry in different types of cataclysmic variables.

The nature of recurrent novae

The observational properties and outburst histories of each member of the small class of recurrent novae are reviewed, with the objective of identifying the outburst mechanisms for these systems. Examples are found of both accretion-powered outbursts (T CrB and RS Oph) and thermonuclear-powered outbursts (T Pyx and U Sco). Outburst properties which might be used in future to distinguish between these mechanisms are identified. Many erstwhile recurrent novae (VY Aqr, RZ Leo, V616 Mon, V1195 Oph, V529 Ori, WZ Sge, and V1017 Sgr) appear to be misclassified examples of other types of cataclysmic variables.

The Nature of Recurrent Novae

AbstractThe observational properties and outburst histories of each member of the small class of recurrent novae are reviewed, with the objective of identifying the outburst mechanisms for these systems. Examples are found of both accretion-powered outbursts (T CrB and RS Oph) and thermonuclear-powered outbursts (T Pyx and U Sco). Outburst properties which might be used in future to distinguish between these mechanisms are identified. Many erstwhile recurrent novae (VY Aqr, RZ Leo, V616 Mon, V1195 Oph, V529 Ori, WZ Sge, and V1017 Sgr) appear to be misclassified examples of other types of cataclysmic variables.

Analysis of cataclysmic variable star energy distributions

I analyze spectrophotometry of cataclysmic variable stars covering the wavelength range 0.32--1.1 ..mu..m. The contributions due to the cool secondary star and the accretion disk are separated, subject to the requirement that the spectrum attributed to the accretion disk be ''physically plausible.'' The results for individual stars, which are largely independent of specific disk models, are presented as limits on the absolute visual magnitude of the disk and its fractional contribution to the light at lambda5500. These limits are given as functions of the spectral type of the (often unseen) secondary star. The results of this study are broadly consistent with previous estimates of the average properties of various types of cataclysmic variables.