Browsing by Author "Suleimanov V."

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  • A neutron star stiff equation of state derived from cooling phases of the X-ray burster 4U 1724-307 
    Suleimanov V.; Poutanen J.; Revnivtsev M.; Werner K. (2011)
    Thermal emission during X-ray bursts is a powerful tool for determining neutron star (NS) masses and radii if the Eddington flux and the apparent radius in the cooling tail can be measured accurately and distances to the ...
  • A non-pulsating neutron star in the supernova remnant HESS J1731-347/G353.6-0.7 with a carbon atmosphere 
    Klochkov D.; Pühlhofer G.; Suleimanov V.; Simon S.; Werner K.; Santangelo A. (2013)
    Context. The central compact object (CCO) candidate in the center of the supernova remnant shell HESS J1731-347/G353.6-0.7 shows no pulsations and exhibits a blackbody-like X-ray spectrum. If the absence of pulsations is ...
  • A reflection model for the cyclotron lines in the spectra of X-ray pulsars 
    Poutanen J.; Mushtukov A.; Suleimanov V.; Tsygankov S.; Nagirner D.; Doroshenko V.; Lutovinov A. (2013)
    Cyclotron resonance scattering features observed in the spectra of some X-ray pulsars show significant changes of the line energy with the pulsar luminosity. At high luminosities, these variations are often associated with ...
  • A search for periodic and quasi-periodic photometric behavior in the cataclysmic variable TT arietis 
    Andronov I.; Arai K.; Chinarova L.; Dorokhov N.; Dorokhova T.; Dumitrescu A.; Nogami D.; Kolesnikov S.; Lepardo A.; Mason P.; Matsumoto K.; Oprescu G.; Pajdosz G.; Passuelo R.; Patkos L.; Senio D.; Sostero G.; Suleimanov V.; Tremko J.; Zhukov G.; Zola S. (1999)
    Observations of TT Ari obtained at 11 observatories (campaign TT Ari-94) during 258 hr were carried out to study optical variability on timescales from minutes to weeks. The best-fit primary photometric period determined ...
  • Absorption features in spectra of magnetized neutron stars 
    Suleimanov V.; Hambaryan V.; Potekhin A.; Pavlov G.; Van Adelsberg M.; Neuhäuser R.; Werner K. (2011)
    The X-ray spectra of some magnetized isolated neutron stars (NSs) show absorption features with equivalent widths (EWs) of 50-200 eV, whose nature is not yet well known. To explain the prominent absorption features in the ...
  • Absorption features in the spectra of X-ray bursting neutron stars 
    Rauch T.; Suleimanov V.; Werner K. (2008)
    Context. The discovery of photospheric absorption lines in XMM-Newton spectra of the X-ray bursting neutron star in EXO0748-676 by Cottam and collaborators allows us to constrain the neutron star mass-radius ratio from the ...
  • Absorption features in the spectra of x-ray bursting neutron stars 
    Suleimanov V.; Rauch T.; Werner K. (2012)
    The photospheric absorption lines in the XMM-Newton spectra of the X-ray bursting neutron star EXO0748-676 were found by Cottam et al. (2002)1 and identified as the n = 2-3 transitions in hydrogen and helium like ions of ...
  • Accretion heated atmospheres of X-ray bursting neutron stars 
    Suleimanov V.; Poutanen J.; Werner K. (2018)
    © ESO 2018. Some thermonuclear (type I) X-ray bursts at the neutron star surfaces in low-mass X-ray binaries take place during hard persistent states of the systems. Spectral evolution of these bursts is well described by ...
  • Basic parameters of the helium-accreting X-ray bursting neutron star in 4U 1820-30 
    Suleimanov V.; Kajava J.; Molkov S.; Nättilä J.; Lutovinov A.; Werner K.; Poutanen J. (2017)
    © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. The ultracompact low-mass X-ray binary 4U 1820-30 situated in the globular cluster NGC 6624 has an orbital period of only ...
  • BeppoSAX observations of GRO J1744-28: Cyclotron line detection and the softening of the burst spectra 
    Doroshenko R.; Santangelo A.; Doroshenko V.; Suleimanov V.; Piraino S. (2015)
    © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We present an analysis of BeppoSAX observations of the unique transient bursting X-ray pulsar GRO J1744-28. The observations ...
  • Broadband X-ray spectrum of intermediate polar V1223 Sgr 
    Revnivtsev M.; Lutovinov A.; Suleimanov V.; Sunyaev R.; Zheleznyakov V. (2004)
    We present the broadband phase averaged spectrum of one of the brightest intermediate polars V1223 Sgr, obtained with INTEGRAL and RXTE observatories (3-100 keV). Good statistical quality of the spectrum in a hard X-ray ...
  • Can optical absorption lines be observed in the spectra of X-ray Novae? 
    Suleimanov V. (1996)
    Synthetic optical spectra and equivalent widths of a number of absorption lines in the spectra of accretion α disks of various luminosity (0.5-0.001 of the Eddington luminosity) around black holes with masses 1.44-10 M⊙ ...
  • Carbon neutron star atmospheres 
    Suleimanov V.; Klochkov D.; Pavlov G.; Werner K. (2014)
    The accuracy of measuring the basic parameters of neutron stars is limited in particular by uncertainties in the chemical composition of their atmospheres. For example, the atmospheres of thermally emitting neutron stars ...
  • Chandra discovery of luminous supersoft X-ray sources in M81 
    Swartz D.; Ghosh K.; Suleimanov V.; Tennant A.; Wu K. (2002)
    A Chandra ACIS-S imaging observation of the nearby galaxy M81 (NGC 3031) reveals nine luminous soft X-ray sources. The local environments, X-ray spectral properties, and X-ray light curves of the sources are presented and ...
  • Comparative analysis of photometric variability of TT ARI in the years 1994-1995 and 2001, 2004 
    Belova A.; Suleimanov V.; Bikmaev I.; Khamitov I.; Zhukov G.; Senio D.; Belov I.; Sakhibullin N. (2013)
    We present the results of photometric observations of a bright cataclysmic variable TT Ari with an orbital period of 0. 13755 days. CCD observations were carried out with the Russian-Turkish RTT 150 telescope in 2001 and ...
  • Dark spot, spiral waves and the SW Sextantis behaviour: It is all about UX Ursae Majoris 
    Neustroev V.; Suleimanov V.; Borisov N.; Belyakov K.; Shearer A. (2011)
    We present an analysis of time-resolved, medium-resolution optical spectroscopic observations of UX Ursae Majoris (UX UMa) in the blue (3920-5250 Å) and red (6100-7200 Å) wavelength ranges that were obtained in 1999 April ...
  • Disk precession and quasi-periodic brightness oscillations of V603 Aql in 2001-2002 
    Suleimanov V.; Bikmaev I.; Belyakov K.; Sakhibullin N.; Zhukov G.; Aslan Z.; Kiziloglu U.; Khamitov I. (2004)
    We present the photometric observations of the old nova V603 Aql with the RTT 150 Russian-Turkish telescope during eleven nights of 2001-2002. We show that the star at this time was in a state with positive superhumps and ...
  • Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state 
    Tsygankov S.; Rouco Escorial A.; Suleimanov V.; Mushtukov A.; Doroshenko V.; Lutovinov A.; Wijnands R.; Poutanen J. (2019)
    © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We report on the discovery of a dramatic change in the energy spectrum of the X-ray pulsar GX 304-1 appearing at low ...
  • Dynamo generated magnetic configurations in accretion discs and the nature of quasi-periodic oscillations in accreting binary systems 
    Moss D.; Sokoloff D.; Suleimanov V. (2016)
    © ESO 2016.Context. Magnetic fields are important for accretion disc structure. Magnetic fields in a disc system may be transported with the accreted matter. They can be associated with either the central body and/or jet, ...
  • Eclipses during the 2010 eruption of the recurrent nova U Scorpii 
    Schaefer B.; Pagnotta A.; Lacluyze A.; Reichart D.; Ivarsen K.; Haislip J.; Nysewander M.; Moore J.; Oksanen A.; Worters H.; Sefako R.; Mentz J.; Dvorak S.; Gomez T.; Harris B.; Henden A.; Tan T.; Templeton M.; Allen W.; Monard B.; Rea R.; Roberts G.; Stein W.; Maehara H.; Richards T.; Stockdale C.; Krajci T.; Sjoberg G.; McCormick J.; Revnivtsev M.; Molkov S.; Suleimanov V.; Darnley M.; Bode M.; Handler G.; Lepine S.; Shara M. (2011)
    The eruption of the recurrent nova U Scorpii on 2010 January 28 is now the all-time best observed nova event. We report 36,776 magnitudes throughout its 67 day eruption, for an average of one measure every 2.6 minutes. ...

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