HVS 4

from Wikipedia, the free encyclopedia
Star
HVS4 / SDSS J091301.0 + 305 120
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation cancer
Right ascension 09 h 13 m 1 s
declination + 30 ° 51 ′ 19.9 ″
Apparent brightness 18.5 likes
Typing
B − V color index −0.4 
Spectral class B.
Astrometry
Radial velocity (600.9 ± 6.2) km / s
distance (200000 ± 30000)  ly
(64000 ± 10000)  pc  
Physical Properties
Effective temperature (14500 ± 600)  K.
Other names
and catalog entries
Other names SDSS J091301.00 + 305119.8 • USNO-A2.0 1200-06254578

HVS4 , catalog name SDSS J091301.0 + 305120 or USNO-A2.0 1200-06254578 , one is hyper-fast running (Engl. Hyper velocity star , shortly HVS ) in the constellation Cancer .

HVS4 is believed to have been ejected about 130 million years ago by an encounter with the black hole in the center of our galaxy. It is now moving away from the galactic center at a speed of almost 600 km / s and is therefore no longer gravitationally bound to the Milky Way .
The HVS4 is probably a B8 star. Based on this, its distance is estimated to be about 61 k pc (about 200,000 light years).

HVS4 was developed by Brown et al. discovered and was the fourth known hyper-speed runner. A total of 16 such stars have been discovered since 2005 (until July 2010). Astronomers hope that the observation of such high-speed stars will also provide clues about the distribution of dark matter in the Milky Way, as it is to be expected that this influences the orbit of the stars.

Individual evidence

  1. ↑ a b c d [BGK2006] HV 4. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on November 3, 2018 .
  2. ↑ a b c Proper Motions and Trajectories for 16 Extreme Runaway and Hypervelocity Stars . In: The Astrophysical Journal . 804, 2015, p. 49. arxiv : 1502.05069 . bibcode : 2015ApJ ... 804 ... 49B . doi : 10.1088 / 0004-637X / 804/1/49 .
  3. ↑ Brown et al. : A Successful Targeted Search for Hypervelocity Stars. In: The Astrophysical Journal, Vol. 640, Issue 1, 2006, pp. L35-L38. doi : 10.1086 / 503279
  4. ↑ Astronews July 27, 2010