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arXiv 0801.2930astro-ph
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行星状星云中的脉泽发射

Maser emission in planetary nebulae

Y. Gomez

摘要:

渐近巨星分支(AGB)顶部的恒星可以表现出来自SiO,H2O和OH等分子的脉泽发射。当恒星演化到行星状星云阶段时,质量损失停止,包层电离开始,使脉泽逐渐消失。PNe中的OH脉泽可以在包层中存在约1000年,但水脉泽只能存在数百年。那么,水脉泽发射是不预期的行星状星云!本文讨论了在两个行星状星云K3 - 35和IRAS17347 - 3139中对水脉泽辐射的清晰探测.

英文摘要:

Stars at the top of the asymptotic giant branch (AGB) can exhibit maser emission from molecules like SiO, H2O and OH. As the star evolves to the planetary nebula phase, mass-loss stops and ionization of the envelope begins, making the masers disappear progressively. The OH masers in PNe can be present in the envelope for periods of ~1000 years but the water masers can survive only hundreds of years. Then, water maser emission is not expected in planetary nebulae! We discuss the unambiguous detection of water maser emission in two planetary nebulae: K 3-35 and IRAS 17347-3139.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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