Prohlížení Acta Polytechnica CTU Proceedings. 2015, vol.2, no. 1 dle názvu

Zobrazují se záznamy 24-43 z 65

    • 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 ...

    • Non Relational Models for the Management of Large Amount of Astronomical Data 

      Autor: Martino, B. L.; Federici, M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The objective of this paper is the comparison between two different database typologies: the relational and the nonrelational architecture, in the context of the applications related to the use and distribution of astronomical ...

    • Observing CVs and LMXBs with SALT: Updates and Recent Results 

      Autor: Buckley, David A. H.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      I present an overview of the ongoing observational programs utilizing the Southern African Large Telescope (SALT), focussing on magnetic Cataclysmic Variables and Low Mass X-ray Binaries. SALT’s instruments and capabilities ...

    • 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 ...

    • On the Influence of Magnetic Field on Accretion Processes in CVs 

      Autor: Bisikalo, D. V.; Zhilkin, A. G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We consider the influence of such parameters as the value of the proper magnetic field Ba and the spin-rotation velocity of the white dwarf on accretion processes in CVs. The results of 3D MHD simulations have shown that ...

    • Optical Low Resolution Spectroscopic Observations of T Pyx during the Early Phase of 2011 Outburst 

      Autor: Arai, A.; Isogai, M.; Yamanaka, M.; Akitaya, H.; Uemura, M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We report on the results of our low resolution spectroscopic observations during the 2011 outburst of the recurrent nova T Pyx. Our observations were performed from 0.19 days to 34 days after the eruption discovered by M. ...

    • 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 ...

    • 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 ...

    • Photometric and Spectroscopic Investigation of the Dwarf Nova HS 0218+3229: A Short Review 

      Autor: Katysheva, N.; Shugarov, S.; Borisov, N.; Gabdeev, M.; Golysheva, P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      This paper is devoted to the study of the cataclysmic variable HS 0218+3229 using the photometric and spectroscopic observations.

    • Photometry and Multipolar Magnetic Field Modeling of Polars: BY Camelopardalis and FL Ceti 

      Autor: Mason, P. A.; Zhilkin, A. G.; Bisikalo, D. V.; Gomez, S.; Morales, J.; Robinson, E. L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We present new broad band optical photometry of two magnetic cataclysmic variable stars, the asynchronous polar BY Camelopardalis and the short period polar FL Ceti. Observations were obtained at the 2.1-m Otto Struve ...

    • 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 ...

    • 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 ...

    • Rotation of the Mass Donors in High-mass X-ray Binaries and Symbiotic Stars 

      Autor: Stoyanov, K.; Zamanov, R.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Our aim is to investigate the tidal interaction in High-mass X-ray Binaries and Symbiotic stars in order to determine in which objects the rotation of the mass donors is synchronized or pseudosynchronized with the orbital ...

    • Simultaneous UBVRI Observations of the AE Aquarii Blobs 

      Autor: Latev, G.; Zamanov, R.; Boeva, S.; Stoyanov, K.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      We summarize the results of our study of the cataclysmic variable AE Aqr on the basis of simultaneous UBV RI observations. For the flares, we estimated the average risetime of about 300 sec, and colours (U−B)0~1.1 and (B−V ...

    • Spectroscopic Monitoring Observations of Nova V1724 Aql in 2012 

      Autor: Kajikawa, T.; Nagashima, M.; Kawakita, H.; Arai, A.; Ikeda, Y.; Isogai, M.; Fujii, M.; Ayani, K.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Spectroscopic and photometric monitoring observations of nova Apl 2012 (V1724 Apl) were conducted at Koyama Astronomical Observatory, Fujii-Kurosaki Observatory and Bisei Astronomical Observatory. The nova was initially ...

    • SS Cygni Revisited 

      Autor: Smith, R. C.; Echevarrıa, J.; Hernandez, J. V.; Szkody, P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      New spectroscopic and photometric observations of SS Cygni, the brightest dwarf nova system, have been obtained, with the aim of mapping starspots on the surface of the secondary star. Four nights of echelle spectroscopy ...

    • Study of Cataclysmic Variables with the Satellites LOFT and Gaia 

      Autor: Hudec, R.; Šimon, V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The goal of this paper is to discuss the capabilities of ESA satellite missions Gaia (already in space) and LOFT (considered for the ESA M4 slot) for investigation of cataclysmic variables (CVs). Both Gaia and LOFT can ...

    • 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 ...

    • Superoutburst of a New Sub-Period-Minimum Dwarf Nova CSS130418 in Hercules 

      Autor: Chochol, D.; Shugarov, S.; Katysheva, N.; Volkov, I.; Zharova, A.; Pavlenko, E.; Pit, N.; Zvagelsky, R.; Antoniuk, O.; Baklanov, A.; Borisov, N.; Gabdeev, M.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Multicolour photometry of a new dwarf nova CSS130418 in Hercules, which underwent superoutburst on April 18, 2013, allow to classified it as a WZ Sge-type dwarf nova. The phase light curves for different stages of superoutburst ...