XTE J1118 + 480
XTE J1118 + 480 | |
---|---|
Position Epoch : J2000.0 Equinox : J2000.0 |
|
Constellation | Ursa Major |
Right ascension | 11 h 18 m 11 s |
declination | + 48 ° 02.2 ′ 0 ″ |
Double star system | |
Type | Low-mass X-ray binary star, SXT |
distance | approx. 6 kLj approx. 2 kpc |
Period of circulation | 0.17 d |
Apparent brightness (V-band) | approx 12.8 mag |
Optical / stellar component | |
Spectral class | approx. K5 V to M0 V |
Dimensions | approx. 0.1 to 0.5 M ☉ |
Compact component | |
Type | Black hole |
Dimensions | approx. 6 to 8 M ☉ |
History and other names | |
discovery |
Rossi X-ray Timing Explorer , March 29, 2000 |
Designations | KV Ursae Majoris |
XTE J1118 + 480 is an X-ray binary star system with a stellar black hole and a companion star of the spectral class K to M. The system is approx. 6200 light years from Earth. This is a Soft X-Ray Transient (SXT for short), a very bright, soft X-ray source .
The system shows quasi-periodic oscillations in the range of a few Hertz. The poloidal magnetic fields at the black hole heat a leptonic plasma , creating a corona in which a jet is created. It is believed that the corona is holey and sits on the accretion disk . XTE J1118 + 480 was spotted on March 29, 2000 during an X-ray burst.
Web links
- Wissenschaft-online.de
- blackholes.stardate.org ( Memento from February 23, 2010 in the Internet Archive )
- Observation objects
- Alpha Centauri: Are Black Holes Moving?