The role of dominant modes in asteroseismology

Research output: Contribution to journalConference article

Abstract

Differences between helio- and asteroseismology are overviewed from observational point of view. Schematic amplitude spectra are presented for a sample of δ Scuti stars (30 cases) with well-determined frequency and amplitude solution (based mostly on multisite international campaigns). Frequency range changes from star to star. Modes are excited on different amplitude levels. However, according to the composite schematic spectrum of the whole sample, the dominant (highest amplitude) modes are concentrated in a narrow frequency range independent from the difference in physical parameters. Two extreme cases (θ Tue and XX Pyx) were localized on the low amplitude tail toward high frequencies. The binary nature and the resonance of the dominant pulsational and orbital periods are mentioned as a possible reason of the unusual amplitude behaviour. Based on synthetic data an examination has been done on the contribution of dominant modes to the star's light variation. Attention is called to the importance of theoretical investigation of dominant (highest amplitude) modes in the golden future of asteroseismology. The non-radial, non-linear stellar modells are urged.

Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number559
Publication statusPublished - Dec 1 2004
EventSOHO 14/GONG 2004 Workshop - Helio- and Asteroseismology: Towards a Golden Future - New Haven, CT, United States
Duration: Jul 12 2004Jul 16 2004

Keywords

  • Amplitudes: binaries: θ Tuc
  • Stars: Delta Scuti: oscillation: frequencies
  • Tidal effects
  • Xx Pyx

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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