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Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358

Vuille, F; O'Donoghue, D; Buckley, DAH; Massacand, C-M; Solheim, JE; Bard, S; Vauclair, G; ... Pajdosz, G; + view all (2000) Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358. Monthly Notices of the Royal Astronomical Society , 314 (4) 689 - 701. 10.1046/j.1365-8711.2000.03369.x. Green open access

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Abstract

We present a detailed mode identification performed on the 1994 Whole Earth Telescope (WET) run on GD 358. The results are compared with that obtained for the same star from the 1990 WET data. The two temporal spectra show very few qualitative differences, although amplitude changes are seen in most modes, including the disappearance of the mode identified as k=14 in the 1990 data. The excellent coverage and signal-to-noise ratio obtained during the 1994 run lead to the secure identification of combination frequencies up to fourth order, i.e. peaks that are sums or differences of up to four parent frequencies, including a virtually complete set of second-order frequencies, as expected from harmonic distortion. We show how the third-order frequencies are expected to affect the triplet structure of the normal modes by back-interacting with them. Finally, a search for ℓ=2 modes was unsuccessful, not verifying the suspicion that such modes had been uncovered in the 1990 data set.

Type: Article
Title: Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.2000.03369.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.2000.03369.x
Language: English
Additional information: © 2000 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/51899
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