Monday, February 23, 2009

astronomical acronym

A cute acronym. It would only be better if the project was one of those requiring exquisite precision in their measurements and error-handling.

Title: The HYPERMUCHFUSS Campaign -- an undiscovered high velocity population
Authors: Alfred Tillich, Stephan Geier, Uli Heber, Heiko Hirsch, Pierre Maxted,
Boris Gaensicke, Tom Marsh, Ralf Napiwotzki, Roy Ă˜stensen and Chris
Categories: astro-ph
Comments: 8 pages, 6 figures, to appear in the Journal of Physics Conference
Proceedings (JPCS) for the 16th European White Dwarf Workshop, Barcelona,
Spain, June 30 - July 11, 2008

We present an overview and a status report of HYPERMUCHFUSS (HYPER velocity
or Massive Unseen Companions of Hot Faint Underluminious Stars Survey) aiming
at the detection of a population of high velocity subluminous B stars and white
dwarfs. The first class of targets consists of hot subdwarf binaries with
massive compact companions, which are expected to show huge radial velocity
variations. The second class is formed by the recently discovered
hyper-velocity stars, which are moving so fast that the dynamical ejection by a
supermassive 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 a
larger population. We applied an efficient selection technique for hot
subdwarfs and white dwarfs with high galactic restframe velocities from the
SDSS spectral data base, which serve as first epoch observations for our
campaign with the ESO VLT and NTT in Chile, the 3.5 m telescope at DSAZ
observatory (Calar Alto) in Spain and the WHT on La Palma. The survey is
nearing completion and provides us with promising candidates which will be
followed up to measure their RV-curves to uncover massive companions or prove
their nature as HVS.
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