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 ...
    • DQ herculis in profile: Whole earth telescope observations and smoothed particle hydrodynamics simulations of an edge-on cataclysmic variable system 

      Wood, Matt A.; Robertson, J. R.; Simpson, James C.; Kawaler, Steven D.; O'Brien, Marlea Sean; Nather, R. Edward; Winget, Don Earl; Montgomery, Michael H.; Metcalfe, Travis S.; Jiang, Xiaojun (2005-11-20)
      The old nova DQ Herculis was the Whole Earth Telescope Northern Hemisphere target for the 1997 July campaign and was observed on four nights with the SARA 0.9 m telescope during 2003 June. We present updated ephemerides ...
    • The pulsation modes of the pre-white dwarf PG 1159-035 

      Costa, Jörge E S; Kepler, Souza Oliveira; Winget, Don Earl; O'Brien, Marlea Sean; Kawaler, Steven D.; Costa, Andrea F Murillo; Giovannini, Odilon; Kanaan, Antonio; Wood, Matt A.; Ahrens, Thomas J. (2008-01)
      Context. PG 1159-035 , a pre-white dwarf with Teff ≃ 140 000 K, is the prototype of both two classes: the PG 1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-035 photometric data obtained ...
    • The δ Scuti star FG Virginis II. A search for high pulsation frequencies 

      Breger, Michel; Handler, Gerald; Serkowitsch, E.; Reegen, Piet; Provençal, Judith L.; Wood, Matt A.; Clemens, J. Christopher; O'Brien, Marlea Sean; Winget, Don Earl; Nather, R. Edward (1996-05)
      Although the δ Scuti and roAp variables occupy similar positions on and near the main sequence, δ Scuti variables pulsate with lower radial and nonradial overtones and lower frequencies. To test whether high frequencies ...