Starquake
- Starquake
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Tremblement d'étoile
Un tremblement d'étoile, starquake en anglais, est un phénomène astrophysique rare qui se produit lorsque la croûte d'un magnétar (une étoile à neutrons possédant un fort champ magnétique) subit un ajustement soudain, analogue à un tremblement de terre. Les magnétars possédent en effet un champ magnétique pouvant dépasser 1011 teslas. Ce champ exerce une telle pression sur le réseau cristallin de la croûte que celle-ci céderait par endroit[1]. Ce phénomène serait à l'origine de certaines bouffées de rayon gamma que les astrophysiciens détectent parfois dans les sursauteurs gamma mous[2].
Références
- ↑ Thompson, C; Duncan, R. C., The soft gamma repeaters as very strongly magnetized neutron stars - I. Radiative mechanism for outbursts, (1995) MNRAS, 275, 255 Résumé disponible sur ADS : 1995MNRAS.275..255T
- ↑ Ibrahim A.I. et al. An Unusual Burst from Soft Gamma Repeater SGR 1900+14: Comparisons with Giant Flares and Implications for the Magnetar Model, (2001), ApJ, 558, 237 Résumé disponible sur ADS : 2001ApJ...558..237I
Voir aussi
Lien externe
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Catégorie : Physique stellaire
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