Procházení Acta Polytechnica CTU Proceedings. 2015, vol.2, no. 1 dle data publikování

Zobrazují se záznamy 21-40 z 65

    • Properties of Recurrent Nova T Pyxidis Based on 2011 Outburst 

      Autor: Tanabe, K.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We reexamine the properties of the recurrent nova T Pyxidis based on our own spectroscopic data accompanying with the photometric ones by VSOLJ (Variable Star Observers League in Japan) during 2011 outburst. One of the ...

    • Recurrent Novae — A Review 

      Autor: Mukai, K.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      In recent years, recurrent nova eruptions are often observed very intensely in wide range of wavelengths from radio to optical to X-rays. Here I present selected highlights from recent multi-wavelength observations. The ...

    • On the 2011 Outburst of the Recurrent Nova T Pyxidis 

      Autor: Izzo, L.; della Valle, M.; Ederoclite, A.; Henze, M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We discuss the nebular phase emission during the 2011 outburst of the recurrent nova T Pyxidis and present preliminaryresults on the analysis of the line profiles. We also present some discussions about the binary system ...

    • The Recurrent Eclipsing Nova U Sco: A Short Review 

      Autor: González-Riestra, R.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      U Scorpii is the recurrent nova with the shortest inter-outburst period, only ten years. The last active phase took place at the beginning of 2010, and it provided a large amount of data from both ground-based and space ...

    • Optical Photometry of LMXBs: UW CrB (=MS 1603+260) and V1408 Aql (=4U 1957+115) 

      Autor: Mason, P. A.; Robinson, E. L.; Gomez, S.; Segura, J. V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We present new optical observations of V1408 Aql (= 4U 1957+115), the only low mass X-ray binary, black hole candidate known to be in a persistently soft state. We combine new broadband optical photometry with previously ...

    • Model Atmosphere Spectrum Fit to the Soft X-Ray Outburst Spectrum of SS Cyg 

      Autor: Suleimanov, V. F.; Mauche, C. W.; Zhuchkov, R. Ya.; Werner, K.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The X-ray spectrum of SS Cyg in outburst has a very soft component that can be interpreted as the fast-rotating optically thick boundary layer on the white dwarf surface. This component was carefully investigated by Mauche ...

    • The Hidden Population of AM CVn Binaries in the Sloan Digital Sky Survey 

      Autor: Carter, P. J.; Marsh, T. R.; Steeghs, D.; Breedt, E.; Copperwheat, C. M.; Gansicke, B. T.; Groot, P. J.; Nelemans, G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We present results from a spectroscopic survey designed to uncover AM Canum Venaticorum (AM CVn) binaries hidden in the photometric database of the Sloan Digital Sky Survey (SDSS). The discovery of only 7 new AM CVns in ...

    • The Role of Magnetic Field for Quiescence-Outburst Models in CVs 

      Autor: De Bianchi, S.; Braga, V. F.; Gaudenzi, S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      In this paper we present the elementary assumptions of our research on the role of the magnetic field in modelling the quiescence-outbursts cycle in Cataclysmic Variables (CVs). The behaviour of the magnetic field is crucial ...

    • Close-In Substellar Companions and the Formation of sdB-Type Close Binary Stars 

      Autor: Zhu, L. Y.; Qian, S. B.; Zhao, E.-G.; Fernández Lajús, E.; Han, Z.-T.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The sdB-type close binaries are believed to have experienced a common-envelope phase and may evolve into cataclysmic binaries (CVs). About 10% of all known sdB binaries are eclipsing binaries consisting of very hot subdwarf ...

    • SWSex Stars, Old Novae, and the Evolution of Cataclysmic Variables 

      Autor: Schmidtobreick, L.; Tappert, C.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The population of cataclysmic variables with orbital periods right above the period gap are dominated by systems with extremely high mass transfer rates, the so-called SW Sextantis stars. On the other hand, some old novae ...

    • Study of Photometric Variability of Selected SU UMa Dwarf Novae 

      Autor: Voloshina, I.; Metlov, V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      In this work we present time-resolved photometry of several poorly-studied dwarf novae during recent superoutbursts. Observations were made with a CCD, mounted on 50- and 60-cm telescopes of the Sternberg Astronomical ...

    • Application of Total Variation Minimization to Doppler Tomography 

      Autor: Uemura, M.; Kato, T.; Nogami, D.; Mennickent, R.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We have developed a new model of the Doppler tomography using total variation minimization (DTTVM). We demonstrated that this method can reconstruct localized and non-axisymmetric profiles possibly having sharp edges in ...

    • New Insights from Inside-Out Doppler Tomography 

      Autor: Kotze, E. J.; Potter, S. B.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We present preliminary results from our investigation into using an “inside-out” velocity space for creating a Doppler tomogram. The aim is to transpose the inverted appearance of the Cartesian velocity space used in normal ...

    • Outburst Properties of V1504 Cyg and V344 Lyr 

      Autor: Cannizzo, J. K.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      I begin by reviewing dwarf novae and the disk instability theory, and then present an overview of three ideas for producing superoutbursts in the SU UMa stars − the thermal tidal instability, irradiation-induced secondary ...

    • What Powers the 2006 Outburst of the Symbiotic Star BF Cygni? 

      Autor: Skopal, A.; Sekeráš, M.; Tomov, N. A.; Tomova, M. T.; Tarasova, T. N.; Wolf, M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      BF Cygni is a classical symbiotic binary. Its optical light curve occasionally shows outbursts of the Z And-type, whose nature is not well understood. During the 2006 August, BF Cyg underwent the recent outburst, and ...

    • Probing the Accretion Processes in Soft X-Ray Selected Polars 

      Autor: Traulsen, I.; Reinsch, K.; Schwope, A. D.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      High-energy data of accreting white dwarfs give access to the regime of the primary accretion-induced energy release and the different proposed accretion scenarios. We perform XMM-Newton observations of polars selected due ...

    • CVs Around the Minimum Orbital Period 

      Autor: Zharikov, S.; Tovmassian, G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We discussed features of Cataclysmic Variables at the period minimum. In general, most of them must be WZ Sge-type objects. Main characteristics of the prototype star (WZ Sge) are discussed. A part of WZ Sge-type objects ...

    • The Space Density of Magnetic and Non-magnetic Cataclysmic Variables, and Implications for CV Evolution 

      Autor: Pretorius, M. L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We present constraints on the space densities of non-magnetic and magnetic cataclysmic variables, and discuss some implications for models of the evolution of CVs. The high predicted non-magnetic CV space density is only ...

    • Activity of the Polar AM Her (RX J1816.2+4952): A Short Review 

      Autor: Šimon, V.; Henden, A.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We show that AM Her displays the transitions between the high and low states with an intermittently existing dominant cycle with length between 400 and 800 days. Moreover, these transitions accumulate in clusters, which ...

    • Workshop on The Golden Age of Cataclysmic Variables and Related Objects - II . 

      Autor: Foreword, Editorial,
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Organizing Institutions:INAF – Istituto di Astrofisica e Planetologia Spaziali, Roma – INAF-IAPS, Roma, ItalyINTA – Dpt. de Cargas Utiles y Ciencias del Espacio, INTA-DCUCE, Madrid, SpainCzech Republic Academy of Sciences ...