Xrg rims manger 0.6j5/25/2023 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 ⊙). 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 J 17544-2619. Spectroscopic study of the optical counterpart to the fast X-ray transient IGR J 17544-2619 based on observations at the 1.5-m RTT-150 telescopeīikmaev, I. Far from presenting a regular variability pattern, XTE J 1739-302 shows periods of high, intermediate, and low flaring activity. We have found that XTE J 1739-302 follows a much more complex behaviour than expected. We have used INTEGRAL and RXTE/PCA observations in order to obtain broad band (1 - 200 keV) spectra and light curves of XTE J 1739-302 and investigate its X-ray spectrum and temporal variability. Our goal is to analyze the properties of XTE J 1739-302/ IGR J17391-3021 within the context of the clumpy structure of the supergiant wind. Only very recently the first attempts to model the behaviour of these sources have been published, some of them within the framework of accretion from clumpy stellar winds. These are X-ray binary systems with a compact companion orbiting a supergiant star which show very short and bright outbursts in a series of activity periods overimposed on longer quiescent periods. ![]() In the past few years, a new class of High Mass X-Ray Binaries (HMXRB) has been claimed to exist, the Supergiant Fast X-ray Transients (SFXT). INTEGRAL Long-Term Monitoring of the Supergiant Fast X-Ray Transient XTE J 1739-302īlay, P. We have modeled the profiles of line HeI 6678 Ã… in spectra of studied optical stars and obtain the parameters of the star's atmosphere. Based on the RTT-150 data we estimated orbital periods of these systems. ![]() ![]() Long-term optical observations of X-ray binary systems IGR J 17544-2619 and IGR J21343+4738 were carried out in 2007-2015. We investigate parameters of two high-mass X-ray binary systems IGR J 17544-2619 and IGR J21343+4738 discovered by INTEGRAL space observatory by using optical data of Russian Turkish Telescope (RTT-150). A Study of the Optical Components of the Hard X-Ray Sources IGR J 17544-2619 and IGR J21343+4738 by Using RTT-150 Observations
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