Browsing by Author "Weston, S."

Now showing items 1-5 of 5

    • The age of white dwarf companions 

      Weston, S.; Napiwotzki, R. (2009)
      We carried out a spectroscopic investigation of single lined white dwarfs (WDs) in double degenerate (DD) systems and discuss their binary evolution. Simulated spectra of the Hα region are used to derive upper limits on ...

    • Anyone out there? Galactic halo post-AGB stars 

      Weston, S.; Napiwotzki, R.; Catalan, S. (American Institute of Physics (AIP), 2010)
      We present results of a survey of post-asymptotic giant branch stars (post-AGBs) at high galactic latitude. To date, few post-AGB stars are known throughout the Galaxy and the number of known members of the older populations ...

    • Central stars of planetary nebulae in SDSS and IPHAS 

      Weston, S.; Napiwotzki, R.; Sale, S.E. (2009)
      Space densities and birthrates of Planetary Nebulae (PNe) are highly uncertain. A large range of formation rates has been derived by different studies, which has led to contradicting ideas for the final evolutionary phases ...

    • Large-scale monitoring of imidacloprid susceptibility in the cat flea, Ctenocephalides felis 

      Rust, M. K.; Denholm, Ian; Dryden, M. W.; Payne, P.; Blagburn, B. L.; Jacobs, D. E.; Bond, R.; Mencke, N.; Schroeder, I.; Weston, S.; Vaughn, M.; Coleman, G.; Kopp, S. (2011-03)
      Although on-animal topical treatment with compounds such as imidacloprid has revolutionized the control of the cat flea, Ctenocephalides felis (Bouche) (Siphonaptera: Pulicidae), the development of insecticide resistance ...

    • The UV-excess survey of the northern galactic plane 

      Groot, P.; Verbeek, K.; Greimel, R.; Irwin, M.J.; Gonzalez-Solares, E.; Gansicke, B.T.; De Groot, E.; Drew, J.E.; Napiwotzki, R.; Weston, S.; Deacon, Niall (2009)
      The UV-Excess survey of the northern Galactic plane images a 10°× 185° wide band, centred on the Galactic equator using the 2.5-m Isaac Newton Telescope in four bands ( U, g, r, He i 5875) down to ∼21–22 mag ( ~20 in He i ...