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ベテルゲウスとアンタレスにある水
1Planetary Systems Branch, Code 693, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
Science (New York, N.Y.)
|February 28, 1998
まとめ
ベテルゲウスとアンタレス星の大気圏で検出された熱水吸収線は,分子水が豊富であることを明らかにしています. この発見は,冷たい恒星の大気組成についての洞察を提供します.
科学分野:
- 天文学と天体物理学について
- スペクトル顕微鏡検査です.
背景:
- 赤外線スペクトルの分析は,恒星の大気の理解に不可欠です.
- 以前の研究では,恒星環境における分子種を調査した.
研究 の 目的:
- ベテルゲウスとアンタレスの赤外線スペクトルの熱水吸収線を特定し,特徴づけること.
- これらの冷たい恒星の大気中の水の起源と豊富さを決定するために.
主な方法:
- ベテルゲウスとアンタレスで得られた赤外線スペクトルの分析.
- 12.3マイクロメートル (811-819cm−1) 近くの吸収線を特定する.
- 太陽のスペクトルの特徴と太陽のスペクトルの比較.
主要な成果:
- 恒星の大気から発生する熱水吸収線の検出.
- スペクトルは,状の太陽光斑スペクトルと類似性を示す.
- 線形地域における上部温度限界は2800 Kである.
- 水柱の密度は (3 ± 2) x 1018 分子/cm2 です.
- 水素に相対する水の豊富さは,約10−7.
結論:
- 熱水分子はベテルゲウスとアンタレスの大気中に存在します.
- これらの水線は,冷たい星や太陽の斑点で見られる条件を示すものです.
- この発見は,恒星の大気の化学組成と熱的構造を理解するのに役立ちます.
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