Non-linear behaviour of the pulsating white dwarf G29-38 - II. Analysis of the phase spectrum

Details Non-linear behaviour of the pulsating white dwarf G29-38 - II. Analysis of the phase spectrum Non-linear behaviour of the pulsating white dwarf G29-38 - II. Analysis of the phase spectrum

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313..179v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 1, pp. 179-184.

Other

6

Stars: Individual: G29-38, Stars: Oscillations, Stars: Variables: Other, White Dwarfs

Scientific paper

An analysis of the phase spectrum of the DA pulsating white dwarf G29-38 over many seasons has been performed. This complements a companion paper which analyses the evolution of the temporal spectrum of G29-38. We show that, with one exception, the relative phases of the harmonics and combination frequencies are all oscillating in phase with their parent modes. This not only suggests that these non-linear frequencies owe their presence to harmonic distortion and not to resonant mode coupling, but also explains the typical pulse shapes observed in the light curves of large-amplitude variable white dwarfs. The one exceptional cross-frequency that does not show a phasing with its parent modes is thought to be a resonance.

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