HE 0457-5439

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Star
HE 0457-5439 / HVS 3
Position of the star in the constellation Swordfish
Position of the star in the constellation Swordfish
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Swordfish
Right ascension 04 h 38 m 12.78 s
declination −54 ° 33 ′ 11.8 ″
Apparent brightness 16.42 mag
Typing
B − V color index −0.24 
Spectral class sdB + F
Astrometry
Radial velocity (723.0 ± 3.0) km / s
distance (61000 ± 10000)  pc  
Physical Properties
Effective temperature (23000 ± 1000)  K.

HE 0437-5439 (HVS 3) is a hyper- fast runner that is observed every three and a half years by the Hubble space telescope . According to NASA , the star has traveled 200,000 light years from the center of the Milky Way in the past 100 million years . He will  leave this at 715 to 723 km / s - i.e. at twice the escape speed .

Representation of the assumed sequence of how HE 0437-5439 was accelerated

Warren Brown of the Harvard-Smithsonian Center for Astrophysics published the discovery in 2010 as the first author of the study in The Astrophysical Journal Letters . Since the star should have burned out after 20 million years, it is assumed that it originally came from a triple star system . About 100 million years ago the triple star system came very close to the black hole in the center of our Milky Way galaxy. One of the three stars is said to have probably been swallowed. The other two stars would have been catapulted away. "The larger of these two burned out faster, bloated into a red giant and absorbed his partner in the process."

Web links

Commons : HE 0437-5439  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d HE 0437-5439. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed March 7, 2020 .
  2. ↑ a b c d 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. ↑ Spectrum of science: 715 km / s
  4. ↑ eso.org: 723 km / s
  5. ↑ “Hubble” discovery: giant star races out of the Milky Way. In: Der Spiegel. March 31, 2011.