# #1751 : Le mystère de Gamma Cassiopeiae enfin résolu

Page: https://stenobird.com/podcast/a-se-passe-l-haut-745418/1751-le-myst-re-de-gamma-cassiopeiae-enfin-r-solu
Text version: https://stenobird.com/podcast/a-se-passe-l-haut-745418/1751-le-myst-re-de-gamma-cassiopeiae-enfin-r-solu.md
Podcast: [Ça Se Passe Là-Haut](https://stenobird.com/podcast/a-se-passe-l-haut-745418)
Published: 2026-03-25T17:23:00+00:00
Episode link: https://www.ca-se-passe-la-haut.fr/2026/03/le-mystere-de-gamma-cassiopeiae-enfin.html
Audio file: https://stats.podcloud.fr/casepasselahaut/numero-1751-le-mystere-de-gamma-cassiopeiae-enfin-resolu/enclosure.b4fa16fba53b72133d6c593f5274bfc2064a064dabc66eb7234f5a588e6abd6f.mp3?p=f
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Duration seconds: 554

## Resource

Des observations à haute résolution obtenues grâce au spectromètre Resolve du télescope spatial XRISM ont permis de résoudre le mystère de l’origine de l’émission X atypique de γ Cassiopeiae (γ Cas), un problème ouvert depuis près d’un demi‑siècle... Les résultats, récemment publiés dans Astronomy & Astrophysics, constituent la première démonstration directe reliant les rayons X durs de γ Cas au mouvement orbital de sa compagne. Source Orbital motion detected in γ Cas Fe K emission lines Yaël Nazé et al. A&A Volume 707 (24 March 2026) https://doi.org/10.1051/0004-6361/202558284 Illustrations Vue d'artiste du système binaire Gamma Cassiopeiae (ESA, Y. Nazé) Yael Nazé

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