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The project Massive Unseen Companions to Hot Faint Underluminous Stars fromSDSS (MUCHFUSS) aims at finding sdBs with compact companions like supermassivewhite dwarfs (M>1.0 Msun), neutron stars or black holes. The existence of suchsystems is predicted by binary evolution theory and recent discoveries indicatethat they are likely to exist in our Galaxy. A determination of the orbitalparameters is sufficient to put a lower limit on the companion mass bycalculating the binary mass function. If this lower limit exceeds theChandrasekhar mass and no sign of a companion is visible in the spectra, theexistence of a massive compact companion is proven without the need for anyadditional assumptions. We identified about 1100 hot subdwarf stars from theSDSS by colour selection and visual inspection of their spectra. Stars withhigh velocities have been reobserved and individual SDSS spectra have beenanalysed. In total 127 radial velocity variable subdwarfs have been discovered.Binaries with high RV shifts and binaries with moderate shifts within shorttimespans have the highest probability of hosting massive compact companions.Atmospheric parameters of 69 hot subdwarfs in these binary systems have beendetermined by means of a quantitative spectral analysis. The atmosphericparameter distribution of the selected sample does not differ from previouslystudied samples of hot subdwarfs. The systems are considered the bestcandidates to search for massive compact companions by follow-up time resolvedspectroscopy.

The MUCHFUSS project - Searching for hot subdwarf binaries with massive unseen companions: Survey, target selection and atmospheric parameters