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Pure iron grains are rare in the universe

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Title: Pure iron grains are rare in the universe
Authors: Kimura, Yuki Browse this author →KAKEN DB
Tanaka, Kyoko K. Browse this author
Nozawa, Takaya Browse this author
Takeuchi, Shinsuke Browse this author
Inatomi, Yuko Browse this author
Issue Date: Jan-2017
Publisher: The American Association for the Advancement of Science(AAAS)
Journal Title: Science advances
Volume: 3
Issue: 1
Start Page: e1601992
Publisher DOI: 10.1126/sciadv.1601992
Abstract: The abundant forms in which the major elements in the universe exist have been determined from numerous astronomical observations and meteoritic analyses. Iron (Fe) is an exception, in that only depletion of gaseous Fe has been detected in the interstellar medium, suggesting that Fe is condensed into a solid, possibly the astronomically invisible metal. To determine the primary form of Fe, we replicated the formation of Fe grains in gaseous ejecta of evolved stars by means of microgravity experiments. We found that the sticking probability for the formation of Fe grains is extremely small; only a few atoms will stick per hundred thousand collisions so that homogeneous nucleation of metallic Fe grains is highly ineffective, even in the Fe-rich ejecta of type Ia supernovae. This implies that most Fe is locked up as grains of Fe compounds or as impurities accreted onto other grains in the interstellar medium.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 木村 勇気

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