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All questions about your order, return and delivery must be sent to our customer service team by e-mail at yourstore@yourdomain.com
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33 toiles extrmement dficientes du halo galactique (ayant moins de 500 fois moins de mtaux que le Soleil) ont t observes haute rsolution spectroscopique. Ces toiles sont les tmoins des tous premiers ges de notre Galaxie. La connaissance dtaille de leur composition chimique permet de contraindre les modles de formation et d'volution de notre galaxie. Les abondances de 17 lments, allant du carbone au zinc, et en particulier, celles d'lments cls comme l'oxygne et le zinc, ont pu tre dtermines avec une prcision ingale. Cela permet une meilleure comprhension du type de supernova qui a enrichi la matire au dbut de la vie de la Galaxie. Par ailleurs, l'volution des abondances en fonction de la mtallicit moyenne est compare aux modles d'volution chimique de la Galaxie. Cette tude portant sur des toiles rputes tre nes au tout dbut de la vie de notre Galaxie, nous apportons des contraintes observationnelles fortes ces modles.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
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