Browsing Research publications by Author "Drechsel, H"

Now showing items 1-3 of 3

    • Brown dwarf companions to white dwarfs 

      Burleigh, Matt R.; Steele, Paul R.; Dobbie, Paul D.; Farihi, Jay; Napiwotzki, Ralf; Maxted, Pierre F. L.; Barstow, Martin A.; Jameson, Richard F.; Casewell, Sarah L.; Gaensicke, Boris T.; Marsh, Tom R. (American Institute of Physics (AIP), 2011)
      Brown dwarf companions to white dwarfs are rare, but recent infra-red surveys are slowly revealing examples. We present new observations of the post-common envelope binary WD0137-349, which reveals the effects of irradiation ...

    • Evolved solar systems in Praesepe 

      Casewell, Sarah L.; Burleigh, Matt R.; Dobbie, Paul D.; Napiwotzki, Ralf (American Institute of Physics (AIP), 2011)
      We have obtained near-IR photometry for the 11 Praesepe white dwarfs, to search for an excess indicative of a dusty debris disk. All the white dwarfs are in the DAZ temperature regime, however we find no indications of a ...

    • Substellar companions and the formation of hot subdwarf stars 

      Geier, Stephan; Heber, Ulrich; Tillich, Alfred; Hirsch, Heiko; Kupfer, Thomas; Schaffenroth, Veronika; Classen, Lew; Maxted, Pierre F. L.; Ostensen, Roy H.; Barlow, Brad N.; Marsh, Tom R.; Gaensicke, Boris T.; Napiwotzki, Ralf; O'Toole, Simon J.; Guenther, Eike W. (American Institute of Physics (AIP), 2011)
      We give a brief review over the observational evidence for close substellar companions to hot subdwarf stars. The formation of these core helium-burning objects requires huge mass loss of their red giant progenitors. It ...