HVS 7

HVS 7
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 33m 12.125s[1]
Declination +01° 08′ 24.87″[1]
Apparent magnitude (V) 17.80
Characteristics
Spectral type sdB[2]
Astrometry
Radial velocity (Rv)518[2] km/s
Proper motion (μ) RA: -1[2] mas/yr
Dec.: 1[2] mas/yr
Distance180000 ly
(55000[3] pc)
Details
Temperature13000[2] K
Other designations
SDSS J113312.12+010824.9, EPIC 201540171
Database references
SIMBADdata

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.[4][5] 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.[5]

References

  1. 1 2 Adelman-McCarthy, Jennifer K. (2008). "The Sixth Data Release of the Sloan Digital Sky Survey". The Astrophysical Journal Supplement Series. 175 (2): 297–313. Bibcode:2008ApJS..175..297A. arXiv:0707.3413 Freely accessible. doi:10.1086/524984.
  2. 1 2 3 4 5 "EPIC 201540171". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 December 2016.
  3. ↑ Brown, Warren R. (2006). "Hypervelocity Stars. I. The Spectroscopic Survey". Bibcode:2006ApJ...647..303B. arXiv:astro-ph/0604111 Freely accessible. doi:10.1086/505165.
  4. ↑ 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:0810.0864 Freely 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.
  5. 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/0604111 Freely 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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