Now showing items 1-5 of 5

    • Asteroseismology of a star cooled by neutrino emission: The pulsating pre-white dwarf PG 0122 + 200 

      O'Brien, Marlea Sean; Vauclair, Gérard P.; Kawaler, Steven D.; Watson, Todd K.; Winget, Don Earl; Nather, R. Edward; Montgomery, Michael H.; Nitta, Atsuko; Kleinman, S.J.; Wood, Matt A. (1998-03-01)
      Observation of g-rnode pulsations in the variable pre-white dwarf (GW Virginis) stars provides a unique means to probe their interiors and to study the late stages of stellar evolution. Multisite campaigns have in several ...
    • Asteroseismology of the PG 1159 star PG 0122+200 

      Fu, Jianning; Vauclair, Gérard P.; Solheim, Jan Erik; Chevreton, M.; Dolez, Noël; O'Brien, Marlea Sean; Kim, Seunglee; Park, Byung Gook; Handler, Gerald; Wood, Matt A. (2007-05)
      Context. The variable pre-white dwarf PG 1159 stars (GW Vir) are g-mode non-radial pulsators. Asteroseismology puts strong constraints on their global parameters and internal structure. PG 0122+200 defines the red edge of ...
    • The period and amplitude changes in the coolest GW Virginis variable star (PG 1159-type) PG 0122+200 

      Vauclair, Gérard P.; Fu, Jianning; Solheim, Jan Erik; Kim, Seunglee; Dolez, Noël; Chevreton, M.; Chen, Li; Wood, Matt A.; Silver, Isaac M.; Bognár, Zs (2011-02-16)
      Context: The PG 1159 pre-white dwarf stars experiment a rapidly cooling phase with a time scale of a few 106 years. Theoretical models predict that the neutrinos produced in their core should play a dominant role in the ...
    • UV observations of the cool DBQA5 white dwarf LDS 678A: Limits on the atmospheric composition, pressure shift, and gravitational redshift derived from C I 2479 

      Oswalt, T. D.; Sión, Edward M.; Hammond, Gordon L.; Vauclair, Gérard P.; Liebert, James W.; Wegner, Gary A.; Koester, Detlev; Marcum, Pamela M. (1991-02)
      We present a high-resolution ultraviolet spectrum of the helium-rich degenerate LDS 678A, obtained with the International Ultraviolet Explorer (IUE) satellite. LDS 678A is the coolest metallic line degenerate (DQ or DZ) ...
    • Whole Earth telescope observations of the ZZ Ceti star HL Tau 76 

      Dolez, Noël; Vauclair, Gérard P.; Kleinman, Scot J.; Chevreton, M.; Fu, Jianning; Solheim, Jan Erik; Pérez, Jaime M González; Wood, Matt A.; Ahrens, Thomas J.; Silvestri, Nicole M. (2006-01)
      This paper analyses the Whole Earth Telescope observations of HL Tau 76, the first discovered pulsating DA white dwarf. The star was observed during two Whole Earth Telescope campaigns. It was a second priority target ...