Sismology of the Sun and of solar-type stars
Optical resonance is essential in building spectrophotometers with an excellent spectral quality. Their application to the seismology of the Sun and solar-type stars allowed to show evidence of pressure modes on Procyon and Alpha Centauri. The eigenmodes we observe are the stationary combination of...
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| Other Authors: | , , |
| Format: | Doctoral or Postdoctoral Thesis |
| Language: | French |
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HAL CCSD
1987
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| Subjects: | |
| Online Access: | https://hal.archives-ouvertes.fr/tel-03216220 https://hal.archives-ouvertes.fr/tel-03216220/document https://hal.archives-ouvertes.fr/tel-03216220/file/These0.0.pdf |
| Summary: | Optical resonance is essential in building spectrophotometers with an excellent spectral quality. Their application to the seismology of the Sun and solar-type stars allowed to show evidence of pressure modes on Procyon and Alpha Centauri. The eigenmodes we observe are the stationary combination of traveling acoustic waves, and carry information on integral properties of the star (e.g. integral of the speed of the sound), and of some parameters of the thermonuclear core.In the solar case, the importance of seismological observations to the tests of the internal structure is now above the measurement of neutrinos flux. We now have enough coherent measurements to study the changes in eigenmodes with solar activity. We show a variation of modes eigenfrequencies between the 1980 SMM data and our own observation from South Pole in 1985.The scientific counterpart of solar seismology is important enough so as to make obvious the need for networks of observation. The IRIS network will bring a temporal coverage allowing the study of the internal structure of the Sun (dynamic, chemical, magnetic.) over duration comparable to the solar cycle. The IRIS-01 experiment was the first site of the Nice network. L'utilisation de la résonance optique permet de construire des spectrophotomètre d'une excellente qualité spectrale. Leur application à la sismologie du soleil et des étoiles de type solaire a permis la mise en évidence des modes propres de pression sur Procyon et Alpha Centauri. Les modes propres que nous avons observés sont la composition stationnaire d'ondes acoustiques se propageant et sont porteurs d'information sur les propriétés intégrale de l'étoile (intégrale de la vitesse du son) ainsi que sur certains paramètres du cœur thermonucléaire. Dans le cas du soleil, la contribution des observations sismologique aux tests de la structure interne dépasse celle des mesures de flux de neutrinos . Nous disposons maintenant de suffisamment de mesures cohérente pour étudier le changement des modes propres avec l'activité ... |
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