ar X iv : a st ro - p h / 99 01 39 7 v 1 2 8 Ja n 19 99 Doppler tomography of intermediate polar spin cycles

ar X iv : a st ro - p h / 99 01 34 4 v 1 2 5 Ja n 19 99 The 1996 dwarf nova outburst of the intermediate polar GK

GK Persei is an intermediate polar that exhibits a dwarf nova outburst approximately every 1000 days. During previous outbursts the system has displayed kilo-second quasi-periodic oscillations (QPOs) in X-ray emission. These oscillations are unique in that they are an order of magnitude longer than QPOs usually observed in disc-fed cataclysmic variables. We have detected the optical counterpart...

ar X iv : a st ro - p h / 99 01 10 8 v 1 1 0 Ja n 19 99 Accretion Disk Models

Models of black hole accretion disks are reviewed, with an emphasis on the theory of hard X-ray production. The following models are considered: i) standard, ii) super-critical, iii) two-temperature, and iv) disk+corona. New developments have recently been made in hydrodynamical models of accretion and in phenomenological radiative models fitting the observed X-ray spectra. Attempts to unify th...

ar X iv : a st ro - p h / 99 01 01 2 v 1 4 J an 1 99 9 Position of First Doppler Peak

In this talk, I describe a calculation of the geodesics since last scattering and derive the dependence of the position of the first Doppler Peak on Ωm and ΩΛ.

ar X iv : a st ro - p h / 99 01 39 9 v 1 2 8 Ja n 19 99 January , 1999 TAC - 1999 - 002 Geometry and Statistics of Cosmic Microwave Polarization

Geometrical and statistical properties of polarization of CMB are analyzed. Singular points of the vector field which describes CMB polarization are found and classified. Statistical distribution of the singularities is studied. A possible signature of tensor perturbations in CMB polarization is discussed. For a further analysis of CMB statistics Minkowski functionals are used, which present a ...

ar X iv : a st ro - p h / 97 01 22 8 v 1 2 9 Ja n 19 97 Large - scale Structures revealed by Wavelet Decomposition 1