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Bikmaev I. F. Irtuganov E. N. Nikolaeva E. A. Sakhibullin N. A. Gumerov R. I. Sklyanov A. S. Glushkov M. V. Khamitov I. M. Borisov V. D. Burenin R. A. Zaznobin I. A. Krivonos R. A. Lyapin A. R. Medvedev P. S. Meshcheryakov A. V. Sazonov S. Yu. Sunyaev R. A. Khorunzhev G. A. Gilfanov M. R. 《Astronomy Letters》2021,47(5):277-290
Astronomy Letters - Results of the spectroscopic observations at the 1.5-m Russian–Turkish telescope for another group of 12 X-ray sources discovered by the eROSITA telescope onboard the SRG... 相似文献
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V. V. Shimansky N. V. Borisov I. F. Bikmaev N. A. Sakhibullin N. N. Shimanskaya O. I. Spiridonova E. N. Irtuganov 《Astronomy Reports》2013,57(3):212-221
The PG 1316+678 star is classified as a pre-cataclysmic binary, as is evidenced by its photometric and spectroscopic observations. Its orbital period is determined to be P orb = 3.3803d, which coincides with the photometric period. The intensities of the emission HI and HeI lines are shown to vary synchronously with the brightness of the object (Δm V = 0.065 m , Δm R = 0.08 m ). These variations arise as the UV radiation from the DAO white dwarf is reflected from the surface of the cold companion. The parameters of the binary are estimated and the time of its evolution after the common-envelope phase is determined to be t ≈ 240 000 years. Thus, PG 1316+678 is a young pre-cataclysmic NN Ser variable with the smallest known photometric reflection effect. 相似文献
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Bikmaev I. F. Irtuganov E. N. Nikolaeva E. A. Sakhibullin N. A. Gumerov R. I. Sklyanov A. S. Glushkov M. V. Borisov V. D. Burenin R. A. Zaznobin I. A. Krivonos R. A. Lyapin A. R. Medvedev P. S. Meshcheryakov A. V. Sazonov S. Yu. Sunyaev R. A. Khorunzhev G. A. Gilfanov M. R. 《Astronomy Letters》2020,46(10):645-657
Astronomy Letters - Results of the first spectroscopic observations at the 1.5-m Russian–Turkish telescope for the X-ray sources discovered by the eROSITA telescope onboard the SRG space... 相似文献
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I. F. Bikmaev E. A. Nikolaeva V. V. Shimansky A. I. Galeev R. Ya. Zhuchkov E. N. Irtuganov S. S. Melnikov N. A. Sakhibullin S. A. Grebenev L. M. Sharipova 《Astronomy Letters》2017,43(10):664-676
We present the results of our long-term photometric and spectroscopic observations at the Russian–Turkish RTT-150 telescope for the optical counterpart to one of the best-known sources, representatives of the class of fast X-ray transients, IGR J17544-2619. Based on our optical data, we have determined for the first time the orbital and physical parameters of the binary system by the methods of Doppler spectroscopy.We have calculated theoretical spectra of the optical counterpart by applying non- LTE corrections for selected lines and obtained the parameters of the stellar atmosphere (T eff = 33 000 K, log g = 3.85, R = 9.5 R ⊙, and M = 23 M ⊙). The latter suggest that the optical star is not a supergiant as has been thought previously. 相似文献
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E. A. Nikolaeva I. F. Bikmaev S. S. Melnikov A. I. Galeev R. Ya. Zhuchkov E. N. Irtuganov 《Bulletin of the Crimean Astrophysical Observatory》2013,109(1):27-31
The paper presents the results of spectroscopic research of the high-mass X-ray binary IGRJ17544-2619 optical component that were carried out with the RTT-150. The analysis of a long series of spectroscopic observations of the optical star of IGRJ17544-2619 system in 2007–2011 was carried out. Orbital parameters of the system were obtained: γ-velocity of 47 km/s, semiamplitude of radial velocity curve K = 30.5 km/s, eccentricity e = 0.44, longitude of the periastron ω = 142°, and an orbital period of the system of 12.17 days. The lower limit of the compact object mass was found to be equal to M = 2.82M ⊙. 相似文献
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V. S. Vorobyev R. A. Burenin I. F. Bikmaev I. M. Khamitov S. N. Dodonov R. Ya. Zhuchkov E. N. Irtuganov A. V. Mescheryakov S. S. Melnikov A. N. Semena A. Yu. Tkachenko N. Aghanim R. A. Sunyaev 《Astronomy Letters》2016,42(2):63-68
We present the results of spectroscopic redshift measurements for the galaxy clusters from the first all-sky Planck catalogue that have been mostly identified based on the optical observations performed previously by our team (Planck Collaboration 2015a). Data on 13 galaxy clusters at redshifts from z ≈ 0.2 to z ≈ 0.8, including the improved identification and redshift measurement for the cluster PSZ1 G141.73+14.22 at z = 0.828, are provided. We have performed the measurements based on data from the Russian–Turkish 1.5-m telescope (RTT-150), the 2.2-m Calar Alto Observatory telescope, and the 6-m SAO RAS telescope (Bolshoy Teleskop Azimutalnyi, BTA). 相似文献
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Gabdeev M. M. Bikmaev I. F. Shimansky V. V. Zhuchkov R. Ya. Irtuganov E. N. 《Astronomy Letters》2021,47(10):695-704
Astronomy Letters - We present the results of our photometric and spectroscopic observations. We have studied four cataclysmic variable stars: 2XMM J183251.4-100106, MLS1809017 J224712+461815,... 相似文献
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Zaznobin I. A. Uskov G. S. Sazonov S. Yu. Burenin R. A. Medvedev P. S. Khorunzhev G. A. Lyapin A. R. Krivonos R. A. Filippova E. V. Gilfanov M. R. Sunyaev R. A. Eselevich M. V. Bikmaev I. F. Irtuganov E. N. Nikolaeva E. A. 《Astronomy Letters》2021,47(2):71-87
Astronomy Letters - We present the results of our identification of eight objects from the preliminary catalogue of X-ray sources detected in the 4–12 keV energy band by the Mikhail Pavlinsky... 相似文献
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