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Просмотр по автору "Sakhibullin N."

Просмотр по автору "Sakhibullin N."

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  • A method for modeling the formation of Call lines in the spectra of irradiated stellar atmospheres 
    Ivanova D.; Sakhibullin N.; Shimanskiǐ V. (2002)
    We have developed a method for calculating deviations from LTE of level populations and profiles of selected spectral lines in stellar atmospheres in the presence of external radiation. The influence of Thomson scattering ...
  • A non-LTE analysis of Mg I lines in the atmospheres of late-type stars 
    Mashonkina L.; Shimanskaya N.; Sakhibullin N. (1996)
    The formation of Mg I lines in the atmospheres of stars with Teff = 5500-7000 K, log g = 2.0-4.5, and [A] = 0, -2 is analyzed. It is shown that the Mg I level population is a nonequilibrium one, and that overionization ...
  • Analysis of fundamental parameters for V477 Lyr 
    Shimansky V.; Pozdnyakova S.; Borisov N.; Bikmaev I.; Galeev A.; Sakhibullin N.; Spiridonova O. (2008)
    We analyze the photometric and spectroscopic observations of the young pre-cataclysmic variable (pre-CV) V477 Lyr. The masses of both binary components have been corrected by analyzing their radial velocity curves. We show ...
  • Analysis of optical light curves for the components of the gravitationally lensed quasar SBS 1520+530 based on observations with the 1.5-m RTT-150 telescope in 2001-2005 
    Khamitov I.; Bikmaev I.; Aslan Z.; Sakhibullin N.; Vlasyuk V.; Zheleznyak A.; Zakharov A. (2006)
    We present the R c-band light curves for components A and B of the gravitationally lensed quasar SBS 1520+530 obtained during 2001-2005 with the 1.5-m Russian-Turkish Telescope (RTT-150) at the TUBITAK National Observatory ...
  • Around-the-clock observations of the Q0957+561A,B gravitationally lensed quasar. II. Results for the second observing season 
    Colley W.; Schild R.; Abajas C.; Alcalde D.; Aslan Z.; Bikmaev I.; Chavushyan V.; Chinarro L.; Cournoyer J.; Crowe R.; Dudinov V.; Evans A.; Jeon Y.; Goicoechea L.; Golbasi O.; Khamitov I.; Kjernsmo K.; Lee H.; Lee J.; Lee K.; Lee M.; Lopez-Cruz O.; Mediavilla E.; Moffat A.; Mujica R.; Ullan A.; Muñoz J.; Oscoz A.; Park M.; Purves N.; Saanum O.; Sakhibullin N.; Serra-Ricart M.; Sinelnikov I.; Stabell R.; Stockton A.; Teuber J.; Thompson R.; Woo H.; Zheleznyak A. (2003)
    We report on an observing campaign in 2001 March to monitor the brightness of the later arriving Q0957+561B image in order to compare with the previously published brightness observations of the (first-arriving) A image. ...
  • Atmospheres and spectra of X-ray illuminated stars: A gray model 
    Sakhibullin N.; Shimanskii V. (1996)
    A gray model is used to explore the effect of heating of stellar atmospheres by an external X-ray flux. This flux is shown to produce additional heating functions in the surface and inner layers. The opacity sources in the ...
  • Atmospheres and spectra of X-ray illuminated stars: A nongray model 
    Sakhibullin N.; Shimanskii V. (1996)
    We continue to study illuminated stellar atmospheres with radiative transfer. A method for computing X-ray irradiated blanketed model atmospheres is described. The heating function of such atmospheres has been found to be ...
  • Broad band variability of SS433: Accretion disk at work? 
    Revnivtsev M.; Fabrika S.; Abolmasov P.; Postnov K.; Bikmaev I.; Burenin R.; Pavlinsky M.; Sunyaev R.; Khamitov I.; Sakhibullin N. (2006)
    We present broad band power spectra of variations of SS433 in radio, optical and X-ray spectral bands. We show that at frequencies lower than 10 -5 Hz the source demonstrates the same variability pattern in all these bands. ...
  • Call line formation in the spectra of irradiated atmospheres 
    Ivanova D.; Sakhibullin N.; Shimanskiǐ V. (2004)
    We have studied the effect of external radiation on the formation of LIE and non-LTE Call lines in the spectra of A - M-star atmospheres. Three frequency distributions were chosen for the external radiation: X-ray radiation ...
  • Chemical compositions of photometric solar-analog stars and F-G stars of different ages 
    Bikmaev I.; Galeev A.; Sakhibullin N.; Musaev F. (2005)
    We present the main results of our study of photometric solar-analog stars. © 2005 International Astronomical Union.
  • 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 ...
  • Coordinated integral and optical observations of SS433 
    Cherepashchuk A.; Sunyaev R.; Fabrikat S.; Molkov S.; Barsukova E.; Antokhina E.; Irsmambetova T.; Panchenko I.; Postnov K.; Seifina E.; Shakura N.; Timokhin A.; Bikmaev I.; Sakhibullin N.; Gnedin Y.; Arkharov A.; Larionov V. (2004)
    Results of simultaneous INTEGRAL and optical observations of galactic microquasar SS433 in May 2003 are presented. The analysis of the X-ray and optical eclipse duration and hard X-ray spectra obtained by INTEGRAL together ...
  • 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 ...
  • Distribution of polarization and intensity of radiation across the stellar disk and numberical values of atmospheric characteristics governing this distribution 
    Bochkarev N.; Karitskaya E.; Sakhibullin N. (1985)
    Computations of polarization and intensity of radiation from a unit stellar surface area are presented, as well as a study of the numerical characteristics of atmospheres - single-scattering albedo Ωλ and the initial source ...
  • Extensive multiband study of the X-ray rich GRB 050408: A likely off-axis event with an intense energy injection 
    De Ugarte Postigo A.; Fatkhullin T.; Jóhannesson G.; Gorosabel J.; Sokolov V.; Castro-Tirado A.; Balega Y.; Spiridonova O.; Jelínek M.; Guziy S.; Pérez-Ramírez D.; Hjorth J.; Laursen P.; Bersier D.; Pandey S.; Bremer M.; Monfardini A.; Huang K.; Urata Y.; Ip W.; Tamagawa T.; Kinoshita D.; Mizuno T.; Arai Y.; Yamagishi H.; Soyano T.; Usui F.; Tashiro M.; Abe K.; Onda K.; Aslan Z.; Khamitov I.; Ozisik T.; Kiziloglu U.; Bikmaev I.; Sakhibullin N.; Burenin R.; Pavlinsky M.; Sunyaev R.; Bhattacharya D.; Kamble A.; Chandra C.; Trushkin S. (2007)
    Aims. Understand the shape and implications of the multiband ligth curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the time from the onset of the γ-ray event ...
  • Formation of Balmer lines in the spectra of X-ray Novae 
    Sakhibullin N.; Suleimanov V.; Shimanskii V.; Suleimanova S. (1998)
    The profiles and equivalent widths of the absorption and emission components of Balmer lines and the continuum optical spectra of X-ray novae during outbursts are calculated. A stationary self-illuminated accretion a disk ...
  • Fundamental parameters of BE UMa revised 
    Shimanskii V.; Borisov N.; Pozdnyakova S.; Bikmaev I.; Vlasyuk V.; Sakhibullin N.; Spiridonova O. (2008)
    We have determined a complete set of parameters for the young pre-cataclysmic variable BE UMa from a comprehensive photometric and spectroscopic analysis using model atmospheres. Our precise photometry and spectroscopy ...
  • INTEGRAL observations of SS433: Results of a coordinated campaign 
    Cherepashchuk A.; Sunyaev R.; Fabrika S.; Postnov K.; Molkov S.; Barsukova E.; Antokhina E.; Irsmambetova T.; Panchenko I.; Seifina E.; Shakura N.; Timokhin A.; Bikmaev I.; Sakhibullin N.; Aslan Z.; Khamitov I.; Pramsky A.; Sholukhova O.; Gnedin Y.; Arkharov A.; Larionov V. (2005)
    Results of simultaneous INTEGRAL and optical observations of the galactic microquasar SS433 in May 2003 and INTEGRAL/RXTE observations in March 2004 are presented. Persistent precessional variability with a maximum to ...
  • Modeling the optical radiation of the precataclysmic variable SDSS J212531-010745 
    Shimansky V.; Borisov N.; Nurtdinova D.; Solovyeva Y.; Sakhibullin N.; Spiridonova O. (2015)
    © 2015, Pleiades Publishing, Ltd. Optical observations are analyzed to derive a set of basic parameters for the precataclysmic variable star SDSS J212531-010745, whose primary is a PG1159-type star. Spectroscopic and ...
  • MT Ser, a binary blue subdwarf 
    Shimanskii V.; Borisov N.; Sakhibullin N.; Sheveleva D. (2008)
    We have classified and determined the parameters of the evolved close binary MT Ser. Our moderate-resolution spectra covering various phases of the orbital period were taken with the 6-m telescope of the Special Astrophysical ...

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