Now showing items 1-6 of 6

    • 2MASS J0516288+260738: Discovery of the first eclipsing late K + Brown dwarf binary system? 

      Schüh, Sonja L.; Handler, Gerald; Drechsel, Horst; Hauschildt, Peter H.; Dreizler, Stefan; Medupe, R.; Karl, C. A.; Napiwotzki, Ralf; Kim, Seunglee; Wood, Matt A. (2003-11)
      We report the discovery of a new eclipsing system less than one arcminute south of the pulsating DB white dwarf KUV 05134+2605 . The object could be identified with the point source 2MASS J0516288+260738 published by the ...
    • 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 ...
    • Constraining convection parameters from the light curve shapes of pulsating white dwarf stars: The cases of EC 14012-1446 and WD 1524-0030 

      Handler, Gerald; Provençal, Judith L.; Montgomery, Michael H.; Romero-Colmenero, Encarni; Sanchawala, Kaushar; Lendl, Monika A.; Wood, A; Silver, Isaac M.; Beck, Paul G.; Chen, Wenping (2008)
      Montgomery [1] developed a method to probe convection in pulsating white dwarf stars which allows the recovery of the thermal response time of the convection zone by fitting observed non sinusoidal light curves. He applied ...
    • The pulsating DA white dwarf star EC 14012−1446: results from four epochs of time-resolved photometry 

      Handler, Gerald; Romero-Colmenero, E.; Provencal, J. L.; Sanchawala, K.; Wood, Matt A.; Silver, Isaac M.; Chen, W. P. (2008)
      The pulsating DA white dwarfs are the coolest degenerate stars that undergo self-driven oscillations. Understanding their interior structure will help us to understand the previous evolution of the star. To this end, we ...
    • The pulsations of PG 1351+489 

      Redaelli, M.; Wood, Matt A.; Kepler, S. O.; Costa, Jörge E. S.; Winget, Don Earl; Handler, Gerald; Castanheira, Bárbara Garcia; Kanaan, Antonio; Fraga, Luciano; Henrique, P. (2011-08-01)
      PG 1351+489 is one of the 20 DBVs - pulsating helium-atmosphere white dwarf stars - known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate ...
    • 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 ...