One more powerful outburst of SS 433статья Электронная публикация

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[1] One more powerful outburst of ss 433 / V. P. Goranskij, E. A. Barsukova, A. N. Burenkov, S. A. Trushkin // The Astronomer’s Telegram. — 2018. — no. 11870. — P. 1–1. In 2018 July 17.772 UT, we registered the onset of a strong outburst which reached maximum brightness of 11.7 mag in the Rc band. It was brighter then the outburst on 2014 July 26 that was recorded as the most brightest in our search (ATel #6347, #6355, #6364, #6385).The observations were performed with the 25-cm telescope and electronic tube equipped by a microchannel plate. The outburst continued more than 6 hours. The last estimate Rc = 12.6 was made on 18.022 UT, the star was far from a quiescent state. Like the previous registered giant outburst, the new one happened in an eclipse, the orbital phases were between 0.95 and 0.97. The precession period phase was 0.17 relative to T3 moment of maximum divergence of relativistic emission components. We have obtained the spectrum with the SAO 1-m telescope and UAGS spectrograph on July 17.83 UT with the signal accumulation of 4800 s, just in the maximum light. Spectral range was 3900 - 7850 Å, resolution was 6 Å. The Hα line has FWHM = 18 Å, what is typical for the quiescent state, FWZI = 93 Å, and EW = 300 Å. The He I emission lines are also typical for quiescence. However, the He II 4686 Å emission line is very bright and wide, so it forms common band with the Bowen blend and the He I 4713 Å line having FWHM = 78 Å and EW = 160 Å. We identified short-wavelength relativistic components of H and He I. Such a spectral behavior differs from the outburst of 2014 July 26 when the Hα line profile had a wide pedestal. SS 433 was observed with the RATAN-600 radio telescope at 2-30 GHz on 2018 July 17.86 UT in the frame of the long-term monitoring of the microquasars (Trushkin et al., 2017). After three weeks of quiet state, fluxes increased by two-three times during a day reaching 1.1 Jy at 4.7 GHz. Spectral index was -0.47, what is the usual value in the outbursts. The radio light curves of SS 433 are given. They will be updated daily.

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