edu.ucar.opensky::articles:6474 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:27:18.961891 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7wq0403 The pulsation modes of the pre-white dwarf PG 1159-035 2008-01-01T00:00:00Z publication https://n2t.org/ark:/85065/d7wq0403 https://doi.org/10.1051/0004-6361:20053470 Costa, J. author Kepler, S. author Winget, D. author O'Brien, M. author Kawaler, S. author Costa, A. author Giovannini, O. author Kanaan, A. author Mukadam, A. author Mullally, F. author Nitta, A. author Provençal, J. author Shipman, H. author Wood, M. author Ahrens, T. author Grauer, A. author Kilic, M. author Bradley, P. author Sekiguchi, K. author Crowe, R. author Jiang, Xiaoyan author Sullivan, D. author Sullivan, T. author Rosen, R. author Clemens, J. author Janulis, R. author O'Donoghue, D. author Ogloza, W. author Baran, A. author Silvotti, R. author Marinoni, S. author Vauclair, G. author Dolez, N. author Chevreton, M. author Dreizler, S. author Schuh, S. author Deetjen, J. author Nagel, T. author Solheim, J. author Gonzalez Perez, J. author Ulla, A. author Barstow, M. author Burleigh, M. author Good, S. author Metcalfe, Travis author Kim, Siwan author Lee, Hee-sang author Sergeev, A. author Akan, M. author Çakirli, Ö. author Paparo, M. author Viraghalmy, G. author Ashoka, B. author Handler, G. author Hürkal, Ö. author Johannessen, F. author Kleinman, S. author Kalytis, R. author Krezesinski, J. author Klumpe, E. author Larrison, J. author Lawrence, T. author Meistas, E. author Martinez, P. author Nather, R. author Fu, J. author Pakstiene, E. author Rosen, R. author Romero-Colmenero, E. author Riddle, R. author Seetha, S. author Silvestri, N. author Vuckovic, M. author Warner, B. author Zola, S. author Althaus, L. author Córsico, A. author Montgomery, M. author UCAR/NCAR - Library publisher 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 with the Whole Earth Telescope (WET) showed a rich frequency spectrum allowing the identification of 122 pulsation modes. Analyzing the periods of pulsation, it is possible to measure the stellar mass, the rotational period and the inclination of the rotation axis, to estimate an upper limit for the magnetic field, and even to obtain information about the inner stratification of the star. Aims.We have three principal aims: to increase the number of detected and identified pulsation modes in PG 1159-035 , study trapping of the star's pulsation modes, and to improve or constrain the determination of stellar parameters. Methods.We used all available WET photometric data from 1983, 1985, 1989, 1993 and 2002 to identify the pulsation periods. Results.We identified 76 additional pulsation modes, increasing to 198 the number of known pulsation modes in PG 1159-035 , the largest number of modes detected in any star besides the Sun. From the period spacing we estimated a mass M/M⊙ = 0.59 ± 0.02 for PG 1159-035 , with the uncertainty dominated by the models, not the observation. Deviations in the regular period spacing suggest that some of the pulsation modes are trapped, even though the star is a pre-white dwarf and the gravitational settling is ongoing. The position of the transition zone that causes the mode trapping was calculated at rc/R* = 0.83 ± 0.05. From the multiplet splitting, we calculated the rotational period Prot = 1.3920 ± days and an upper limit for the magnetic field, B < 2000 G. The total power of the pulsation modes at the stellar surface changed less than 30% for L = 1 modes and less than 50% for L = 2 modes. We find no evidence of linear combinations between the 198 pulsation mode frequencies. PG 1159-035 models have not significative convection zones, supporting the hypothesis that nonlinearity arises in the convection zones in cooler pulsating white dwarf stars. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication An edited version of this paper was published by EDP Sciences. Copyright 2008 European Southern Observatory. None eng geoscientificInformation