HVS 7

HVS 7 -- hyper-velocity star 7, otherwise known as SDSS J113312.12+010824.9 is a rare star that has been accelerated to faster than our Milky Way Galaxy's escape velocity.[1][2] In 2013 a team under N. Przybilla wrote that the star had a chemically peculiar photosphere, which masked its origins.

The star was first cataloged during the Sloan Digital Sky Survey. It was identified as a hyper-velocity star in 2006.[2]

References

  1. ↑ N. Przybilla, M. F. Nieva1, A. Tillich1, U. Heber1, K. Butler, W. R. Brown (2013-02-21). "HVS 7: a chemically peculiar hyper-velocity star". Astronomy & Astrophysics. arXiv:0810.0864Freely accessible. Such a surface abundance pattern is caused by atomic diffusion in a possibly magnetically stabilised, non-convective atmosphere. Hence all chemical information on the star’s place of birth and its evolution has been washed out. High precision astrometry is the only means to validate a GC origin for HVS 7.
  2. 1 2 Brown, Warren R.; Geller, Margaret J.; Kenyon, Scott J.; Kurtz, Michael J. (2006-04-13). "Hypervelocity Stars. I. The Spectroscopic Survey". Harvard University. pp. 303–311. arXiv:astro-ph/0604111Freely accessible. Here we report the two most recently discovered HVSs: SDSS J110557.45+093439.5 and possibly SDSS J113312.12+010824, traveling with Galactic rest-frame velocities at least +508+/-12 and +418+/-10 km s-1, respectively.
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