Spectroscopic Study Of The Optical Counterpart To The Fast X-Ray Transient Igr J17544-2619 Based On Observations At The 1.5-M Rtt-150 Telescope
| Autor: | A. I. Galeev, E. A. Nikolaeva, I. F. Bikmaev, V. V. Shimansky, L. M. Sharipova, S. S. Melnikov, R. Ya. Zhuchkov, E. N. Irtuganov, S. Grebenev, N. Sakhibullin |
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| Rok vydání: | 2017 |
| Předmět: |
3D optical data storage
X-ray transient Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Spectral line law.invention Telescope symbols.namesake law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Binary system 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics 010308 nuclear & particles physics Stellar atmosphere Astronomy and Astrophysics Space and Planetary Science symbols Astrophysics::Earth and Planetary Astrophysics Supergiant Astrophysics - High Energy Astrophysical Phenomena Doppler effect |
| Popis: | 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 computed theoretical spectra of the optical counterpart by applying non-LTE corrections for selected lines and obtained the parameters of the stellar atmosphere and the optical star ($T_{\rm eff}=33\,000$ K, $\log\,g=3.85$, $R=9.5\ R_{\odot},$ and $M=23\ M_{\odot}$). The latter suggest that the optical star is not a supergiant as has been thought previously. 13 pages, 11 figures, 4 tables |
| Databáze: | OpenAIRE |
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