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
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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" (PDF). Astronomy & Astrophysics. Retrieved 2015-03-18.
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.
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Brown, Warren R.; Geller, Margaret J.; Kenyon, Scott J.; Kurtz, Michael J. (2006-04-13). "Hypervelocity Stars. I. The Spectroscopic Survey" (PDF). Harvard University. p. 303-311. Retrieved 2015-03-18.
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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