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Chapter and Conference Paper
Identification of a Complete Sample of Northern Rosat All-Sky Survey X-Ray Sources
We present results of the optical identification of a spatially complete, flux limited sample of about 700 ROSAT All-Sky X-ray sources contained in 6 study areas north of δ = -9° with |b II ...
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Chapter and Conference Paper
The New Ultrashort-Period Cataclysmic Variable RX J0757.0+6306
A new cataclysmic variable is identified as the optical counterpart of the X-ray source RX J0757.0+6306. The emission lines bear evidence of a strong disc with an S-wave with period of 75±1.4 min, which we ide...
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Chapter and Conference Paper
Map** the Total Gravitating Mass in Three Groups of Galaxies
We report on the detection and analysis of hot ionized gas in three groups of galaxies (MKW4s, AWM5, NGC 6329 group) at distances above 100 Mpc (recession velocities above 8000 km s-1). In all three cases their e...