Extreme outburst of SS 433 observed in eclipseстатья

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[1] Goranskij V. P., Spiridonova O. I. Extreme outburst of ss 433 observed in eclipse // The Astronomer’s Telegram. — 2014. — no. 6347. — P. 1–1. On 2014 July 26.778 UT, we recorded very strong outburst of SS 433 with the eye monitoring using the 25 cm telescope and electronic tube equipped by a microchannel plate. The device is sensitive to red and near infrared light with the maximum sensitivity consistent with that of Rc band. The object brightness reached r = 11.8 mag, and exceeded the maximum outburst brightness previously recorded with this 11-year monitoring by 0.3 mag. Immediately, we measured the object on July 26.794 UT by the distant pointing of the SAO 1 m Zeiss reflector with the CCD photometer, and obtained the following magnitudes: U = 16.47; B = 15.676; V = 13.592; Rc = 11.810; Ic = 10.290. The orbital and precession phases of this observation calculated with the ephemeris (Goranskij, 2011, Variable Stars Vol.31, No.5) are accordingly of 0.97 (close to eclipse center) and 0.32 (close to T_1 crossover). These magnitudes are the brightest recorded by us in U, Rc and Ic bands. In the Ic filter, the magnitude exceeds previously recorded maximum by 0.48 mag. But magnitudes in B and V bands are typical for the strong outbursts. It is known that the spectral energy distribution of SS 433 consists of two components, one having very hot power spectrum changing with the periods of orbit, precession and nodding, and other one with the cool spectrum detectable in red and infrared bands and showing irregular variations and outbursts. The light curves of these two sources may be extracted separately from the common light in V and R bands due to large difference of their intrinsic colors. The nature of the cool source is still questionable. High flux excesses in Rc and Ic bands recorded in the present observation are related to the partial eclipse of the hot source. At the same time the recorded event is extreme. Radio observations, if they were carried out near this date, can establish the location and the nature of this source.

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