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The B-type giant HD 271791 in the Galactic halo : Linking run-away stars to hyper-velocity stars
(2008-05-01)
Context. Young, massive stars have been found in the distant Galactic halo. Dynamical ejection from the Galactic disc has been suggested as the origin of these "run-away stars". The so-called hyper-velocity stars have been ...
Binary sdB Stars with Massive Compact Companions
(Astronomical Society of the Pacific, 2008)
The masses of compact objects like white dwarfs, neutron stars and black holes are fundamental to astrophysics, but very difficult to measure. We present the results of an analysis of subluminous B (sdB) stars in close ...
Hypervelocity Stars: Young and Heavy or Old and Light?
(Astronomical Society of the Pacific, 2008)
The first three hyper-velocity stars (HVS) unbound to the Galaxy were serendipitously discovered in 2005. The only suggested origin of hyper-velocity stars is the Galactic Centre as it hosts a super-massive black hole ...