SS 433
 Artist's impression of SS 433 |
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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|---|---|
| Constellation | Aquila |
| Right ascension | 19h 11m 49.56s |
| Declination | +04° 58′ 57.6″ |
| Apparent magnitude (V) | 14.2 |
| Characteristics | |
| Spectral type | A7Ib |
| Variable type | Eclipsing Binary |
| Astrometry | |
| Distance | 18000±700 ly (5500±200pc) |
| Other designations | |
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V1343 Aql, GAL 039.7-02.0, 2MASS J19114957+0458578, USNO 659, 1A 1909+04, 87GB 190920.8+045332, NEK 40.1-02.1, 3A 1909+048, GPS 1909+049, RGB J1911+049, BWE 1909+0453, GRS 039.60 -01.80, RX J1911.7+0459, 4C 04.66, 1H 1908+047, 1RXS J191149.7+045857, 2E 1909.3+0453, HBHA 204-02, AAVSO 1906+04, 2E 4204, INTEGRAL1 110, TXS 1909+048, 1ES 1909+04.8, INTREF 969, 4U 1908+05.
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| Database references | |
| SIMBAD | data |
SS 433 is one of the most exotic star systems observed. It is an eclipsing X-ray binary system, with the primary most likely a black hole, or possibly a neutron star., pp. 23–24. The spectrum of the secondary companion star suggests that it is a late A-type star. SS 433 is a microquasar, the first discovered.
SS 433's designation comes from the initials of two astronomers at Case Western Reserve University: Nicholas Sanduleak and C. Bruce Stephenson. It was the 433rd entry in their 1977 catalog of stars with strong emission lines.
SS 433, also known as V1343 Aquilae, located at 5.5 kpc in the galactic plane (l= 39.7° and b= -2.2°)
The compact central object is consuming the companion star which rapidly loses mass into an accretion disc formed around the central object. The accretion disc is subject to extreme heating as it spirals into the primary and this heating causes the accretion disc to give off intense X-rays and opposing jets of hot hydrogen along the axis of rotation, above and below the plane of the accretion disc. The material in the jets travels at 26% of the speed of light., pp. 23–24;, p. 508. The companion star presumably had lower mass than the original primary object and was therefore longer lived. Estimates for its mass range from 3, p. 25 to 30solar masses. The primary and secondary orbit each other at a very close distance in stellar terms, with an orbital period of 13.1 days., p. 510.
The jets from the primary are emitted perpendicular to its accretion disk. The jets and disk precess around an axis inclined about 79° to a line between Earth and SS 433. The angle between the jets and the axis is around 20°, and the precessional period is around 162.5 days. Precession means that the jets sometimes point more towards the Earth, and sometimes more away, producing both blue and red Doppler shifts in the observed visible spectrum., p. 508. Also, the precession means that the jets corkscrew through space in an expanding helical spray. As they impact the surrounding W50 supernova remnant clouds, they distort it into an elongated shape.
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