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Optical identification of a new cataclysmic variable from integral all sky survey: IGR J08390--4833
M. Revnivtsev, A. Kniazev, S. Sazonov +6
We have optically identified a recently discovered INTEGRAL source, IGR J08390--4833, with a cataclysmic variable, i.e. an accreting white dwarf in a binary system. The spectrum ex…
Serendipitous VLBI detection of rapid, large-amplitude, intraday variability in QSO 1156+295
T. Savolainen, Y. Y. Kovalev
We report a serendipitous detection of rapid, large amplitude flux density variations in the highly core-dominated, flat-spectrum radio quasar 1156+295 during an observing session…
Stellar populations and galaxy evolution in the NGC 80 group
Olga K. Silchenko, Victor L. Afanasiev
We have studied the central parts of seven early-type galaxies -- the members of the X-ray-bright galaxy group NGC 80 -- by means of integral-field spectroscopy at the Russian 6m t…
An Extreme Solar Event of 20 January 2005: Properties of the Flare and the Origin of Energetic Particles
V. V. Grechnev, V. G. Kurt, I. M. Chertok +9
The extreme solar and SEP event of 20 January 2005 is analyzed from two perspectives. Firstly, we study features of the main phase of the flare, when the strongest emissions from m…
Superorbital variability of X-ray and radio emission of Cyg X-1. I. Emission anisotropy of precessing sources
A. Ibragimov, A. A. Zdziarski, J. Poutanen
We study theoretical interpretations of the 150-d (superorbital) modulation observed in X-ray and radio emission of Cyg X-1 in the framework of models connecting this phenomenon to…
A cool R Coronae Borealis star Z UMi
Tonu Kipper, Valentina Klochkova
The high resolution spectra of a R CrB type star Z UMi are analysed. The atmospheric parameters of Z UMi are estimated: Teff=5250+/-250K and log g=0.5+/-0.3. This places Z UMi amon…