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Abstract: We present an overview and a status report of HYPERMUCHFUSS HYPER velocityor Massive Unseen Companions of Hot Faint Underluminious Stars Survey aimingat the detection of a population of high velocity subluminous B stars and whitedwarfs. The first class of targets consists of hot subdwarf binaries withmassive compact companions, which are expected to show huge radial velocityvariations. The second class is formed by the recently discoveredhyper-velocity stars, which are moving so fast that the dynamical ejection by asupermassive black hole seems to be the only explanation for their origin.Until now only one old hyper-velocity star has been found, but we expect alarger population. We applied an efficient selection technique for hotsubdwarfs and white dwarfs with high galactic restframe velocities from the\emph{SDSS} spectral data base, which serve as first epoch observations for ourcampaign with the ESO VLT and NTT in Chile, the 3.5 m telescope at DSAZobservatory Calar Alto in Spain and the WHT on La Palma. The survey isnearing completion and provides us with promising candidates which will befollowed up to measure their RV-curves to uncover massive companions or provetheir nature as HVS.



Author: Alfred Tillich, Stephan Geier, Uli Heber, Heiko Hirsch, Pierre Maxted, Boris Gaensicke, Tom Marsh, Ralf Napiwotzki, Roy Østensen

Source: https://arxiv.org/







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