Now showing items 1-4 of 4

    • Abundance of elements beyond the iron group in cool do white dwarfs 

      Chayer, Pierre; Vennes, Stéphane; Dupuis, Jean François; Kruk, Jeffrey W. (2005-09-10)
      We report the presence of elements beyond the iron group in the atmospheres of the cool DO white dwarfs HD 149499 B and HZ 21. Photospheric lines of germanium (Z = 32), arsenic (33), selenium (34), tin (50), tellurium (52), ...
    • FUSE observations of intermediate temperature DA: Atmospheric parameters and metal abundances 

      Dupuis, Jean François; Hénault-Brunet, Vincent; Chayer, Pierre; Vennes, Stéphane; Kruk, Jeffrey W. (2009)
      We present results from our analysis of a sample of DA white dwarfs having effective temperature below 25,000 K observed with the FUSE satellite with the goals of better understanding the origin of metals detected in the ...
    • Iron in hot DA white dwarfs 

      Vennes, Stéphane; Chayer, Pierre; Dupuis, Jean François; Lanz, Thierry M. (2006-12-01)
      We present a study of the iron abundance pattern in hot, hydrogen-rich (DA) white dwarfs. The study is based on new and archival far-ultraviolet spectroscopy of a sample of white dwarfs in the temperature range 30,000 K ≲ ...
    • Orbital parameters and chemical composition of four white dwarfs in post-common-envelope binaries 

      Kawka, Adéla; Vennes, Stéphane; Dupuis, Jean François; Chayer, Pierre; Lanz, Thierry M. (2008-03-10)
      We present FUSE observations of the hot white dwarfs in the post-common-envelope binaries Feige 24, EUVE J0720-317, BPM 6502, and EUVE J2013+400. The spectra show numerous photospheric absorption lines, which trace the ...