SS433: A massive X-ray binary in an advanced evolutionary stage

Cherepashchuk, A. M.; Постнов, К. А.; Molkov, S.; Antokhina, É. A.; Belinski, A. A.

doi:10.1016/j.newar.2020.101542

Cited by 27 publications

(21 citation statements)

References 68 publications

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“…Over the past 40 years, the object SS433 has been studied in detail in the optical, IR, X-ray and radio ranges (see, for example, reviews [6,7] where all the necessary references are given). Many new and interesting results were obtained on the object SS433, which turned out to be the first example of a microquasar in our Galaxy.…”

Section: Unsolved Problemsmentioning

confidence: 99%

“…Despite more than forty years of research, the nature of the relativistic object in the SS433 system remained completely unclear until recently (see discussions on this topic in [6,7,20]). In [19,20], using information on the constancy of the orbital period of SS433 over 28 years [27,28], the authors estimated the ratio of the masses of the components in the SS433 q = M x M v = 0.6 (M x and M v are the masses of a relativistic object and an optical star, respectively).…”

Section: The Discovery Of An Increase In the Orbital Period Of The Ss433 System: A Strong Argument For The Presence Of A Black Holementioning

confidence: 99%

“…In the review by [7], the results of the interpretation of the eclipsing (orbital) and precessional variability in the hard X-ray range (kT ≈ 18-60 keV) were summarized. It was shown that, since the X-ray spectrum hardness does not change with the phase of the orbital and precessional variability (the observed X-ray flux changes by about five times), the hard X-ray radiation in contradiction to the soft X-ray radiation (kT ≈ 2-10 keV) is formed, not in narrow jets but in an extended quasi-isothermal hot corona of the accretion disc.…”

Section: Other Estimates Of the Mass Ratiomentioning

confidence: 99%

“…Fortunately, this hypothesis did not manage to appear in scientific publications since, in 1979, it turned out [4,5] that the moving lines in the spectrum of SS433 are formed in relativistic (v 0.26c) collimated jets that are ejected from some central source and precess with a period of ≈164 d. The opening angle of the precession cone is ≈20 • , and the precession axis is inclined with respect to the line of sight by an angle of ≈79 • . Although the nature of the central source remained unclear, speculation arose that all of these phenomena were enacted in a binary system [6,7]. The binary system model was proposed in 1980 by [8], who measured the Doppler shifts of the narrow components of the stationary hydrogen lines and found a period of ≈13.1 d, which testified in favor of the close binary system model.…”

Section: Introductionmentioning

confidence: 99%

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Progress in Understanding the Nature of SS433

Cherepashchuk

2021

Universe

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SS433 is the first example of a microquasar discovered in the Galaxy. It is a natural laboratory for studies of extraordinarily interesting physical processes that are very important for the relativistic astrophysics, cosmic gas dynamics and theory of evolution of stars. The object has been studied for over 40 years in the optical, X-ray and radio bands. By now, it is generally accepted that SS433 is a massive eclipsing X-ray binary in an advanced stage of evolution in the supercritical regime of accretion on the relativistic object. Intensive spectral and photometric observations of SS433 at the Caucasian Mountain Observatory of the P. K. Sternberg Astronomical Institute of M. V. Lomonosov Moscow State University made it possible to find the ellipticity of the SS433 orbit and to discover an increase in the system’s orbital period. These results shed light on a number of unresolved issues related to SS433. In particular, a refined estimate of the mass ratio MxMv>0.8 was obtained (Mx and Mv are the masses of the relativistic object and optical star). Based on these estimates, the relativistic object in the SS433 system is the black hole; its mass is >8M⊙. The ellipticity of the orbit is consistent with the “slaved” accretion disc model. The results obtained made it possible to understand why SS433 evolves as the semi-detached binary instead of the common envelope system.

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Section: Unsolved Problemsmentioning

confidence: 99%

Section: The Discovery Of An Increase In the Orbital Period Of The Ss433 System: A Strong Argument For The Presence Of A Black Holementioning

confidence: 99%

Section: Other Estimates Of the Mass Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Progress in Understanding the Nature of SS433

Cherepashchuk

2021

Universe

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“…This paper is to do with the origin of these flares, which must surely be related to the transfer of mass from the donor star to the compact object in this binary system. General reviews are to be found in [1,2]. All these details are of particular interest because SS 433 would be classified as an Ultra-Luminous X-ray source were we looking down its throat [3], and the emission spectra of those ULX with optical counterparts are very like those of SS 433 [4].…”

Section: Introductionmentioning

confidence: 99%

SS 433 Optical Flares: A New Analysis Reveals Their Origin in L2 Overflow Episodes

Bowler

2021

Galaxies

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The microquasar SS 433 exhibits in Hα intermittent flares. A sequence of observations made in 2004 showed flaring Doppler shifted to both the red and the blue simultaneously. The mean shifts varied from day to day, following the orbital phase of the compact object. At the time, this behaviour was interpreted as indicating an origin in the outer rim of the accretion disk. A new analysis of these old data, presented in this paper, shows that the flares are not eclipsed by the Companion that eclipses the photosphere surrounding the compact object. They are therefore not intermittent sightings of an accretion disk. The alternative explanation is plasma expelled through the L2 point, following the phase of the orbit as it invades the space beyond the system. That space has been mapped with comparatively recent GRAVITY observations of a similar flare in Brγ, indeed revealing a strong rotation component.

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