National Repository of Grey Literature 43 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
Formation of eccentric disks around black holes
Hadrava, Petr ; Řezáč, R. ; Oestgaard, E.
The formation and evolution of eccentric disks around black holes due to explosion of a companion on an eccetric orbit is modeled by means of exact general-relativistic N-particle treatment. It is shown that in spite of the generally accepted view that the debris must be quickly smeared out to a circular accretion disk.
Long-term activity of the X-ray source QR And / RX J0019.8+2156
Šimon, Vojtěch ; Sobotka, P. ; Marek, P. ; Lehký, M. ; Šmelcer, L. ; Lomoz, Fr.
QR And has been monitored in the framework of the observational campaing which started in 1998. The authors resolved prominent variations of the orbital modulation which depend on the state of the long-term activity of the system.
Long-term variability of dwarf novae and soft X-ray transients
Šimon, Vojtěch
The results of analysis of Tc by the method of the O-C residuals is presented for a set of DN of various types and some SXTs.
Modernization of the HSFA solar instruments at the OndĹejov Observatory of the Astronomical institute of the Academy of sciences of the Czech republic
Klvaňa, Miroslav ; Bumba, Václav ; Halík, M. ; Ulrich, J. ; Chvojka, M.
The two horizontal solar telescopes with spectrographs HSFA at the OndĹejov observatory are modernized for exploitation of both their spectrographs as for the photographic observations, as well as for the registration of spectra with the CCD cameras or photomultipliers. The conception of the reconstruction, emphasizing the new possibilities of both instruments is discussed.
Solar activity impulses
Bumba, Václav ; Klvaňa, Miroslav ; Garcia, A.
We study the sums of sunspot areas separately for the norhtern and southern hemisphere for each day during the four low activity cycles. During certain time intervals, the solar activity is characterized by isolated, suddenly appearing increases, on one, or simultaneously on both hemispheres.

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