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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 ...

    J. Krautter, I. Thiering, F.-J. Zickgraf… in New Horizons from Multi-Wavelength Sky Sur… (1998)

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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...

    G. Tovmassian, J. Greiner, F.-J. Zickgraf, P. Kroll… in Astronomical Time Series (1997)

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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...

    I. Thiering, Dahlem M. in New Light on Galaxy Evolution (1996)