The pulsation modes of the pre-white dwarf PG 1159-035
نویسندگان
چکیده
منابع مشابه
The pulsation modes of the pre - white dwarf PG 1159 - 035
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 m...
متن کاملThe Spectral Variability of Pulsating Stars : PG 1159 - 035
With 10m class telescopes as well as with time-tagging detectors on board of HST and FUSE, the analysis of time-resolved spectra for pulsating white dwarfs becomes feasible. We present simulated time-resolved spectra for the hot pulsating white dwarf PG 1159-035 and compare these models with observational data of the 516 s mode based on HST-STIS spectroscopy. A determination of the pulsation mo...
متن کاملSoft X - ray Spectroscopy of the Hot DA White Dwarf LB 1919 and the PG 1159 Star PG 1520 + 525
We have performed soft X-ray spectroscopy of two hot white dwarfs with the Chandra observatory using the Low Energy Transmission Grating. The first target is the hot DA white dwarf LB1919 (T eff =69 000 K). This star is representative of a small group of hot DAs whose metallicities lie well below predictions from radiative levitation theory. The Chandra spectrum shows a rich absorption line spe...
متن کاملThe Pulsating Pre { White Dwarf Star PG 0122 + 200
We present an analysis of single{site time{series photometry of the pulsating pre{white dwarf PG 0122+200. We show the pulsations are consistent with a pattern of modes equally spaced in period; both the observed period range and spacing con rm that PG 0122 is a g{mode pulsator. PG 0122 shows a pattern similar to that seen in multi{site observations of PG 2131+066 and PG 1159{035. The measured ...
متن کاملAsteroseismological measurements on PG 1159−035, the prototype of the GW Vir variable stars
Aims. An asteroseismological study of PG 1159−035, the prototype of the GW Vir variable stars, has been performed on the basis of detailed and full PG1159 evolutionary models presented by Miller Bertolami & Althaus (2006). Methods. We carried out extensive computations of adiabatic g-mode pulsation periods on PG1159 evolutionary models with stellar masses spanning the range 0.530 to 0.741M⊙. Th...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20053470