Browsing by Author "Rollenhagen, K."

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    • DAZ White Dwarfs in the SPY Sample 

      Koester, D.; Rollenhagen, K.; Napiwotzki, R.; Voss, B.; Christlieb, N.; Homeier, D.; Reimers, D. (Astronomical Society of the Pacific, 2005)
      We search for faint Ca II lines in the spectra of about 800 apparently single white dwarfs observed at high resolution for the SPY (ESO Supernova Progenitor Survey) survey. Photospheric Ca is detected in 24 DAZ; in 25 ...

    • Metal traces in white dwarfs of the SPY (ESO Supernova Ia Progenitor Survey) sample 

      Koester, D.; Rollenhagen, K.; Napiwotzki, R.; Voss, B.; Christlieb, N.; Homeier, D.; Reimers, D. (2005-03)