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arXiv 1301.2867astro-ph.SR
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演化恒星中的结晶硅酸盐I. IRAS16456-3542、18354-0638和23239+5754的Spitzer/IRS光谱

Crystalline Silicates in Evolved Stars. I. Spitzer/IRS Spectroscopy of IRAS16456-3542, 18354-0638, and 23239+5754

B. W. Jiang, Ke Zhang, Aigen Li, C. M. Lisse

摘要:

我们报告了斯皮策红外光谱仪(IRS)对三颗演化恒星的观测结果:IRAS 16456-3542,18354-0638和23239+5754。9.9- 37.2 μ m的Spitzer/IRS高分辨光谱显示出以顽火辉石为主的结晶硅酸盐发射特征。IRAS 16456-3542的结晶硅酸盐含量非常丰富,其硅酸盐质量的90%以上为结晶形式,是迄今为止报道的结晶硅酸盐来源中最高的。

英文摘要:

We report the Spitzer Infrared Spectrograph (IRS) observations of three evolved stars: IRAS 16456-3542, 18354-0638, and 23239+5754. The 9.9--37.2um Spitzer/IRS high resolution spectra of these three sources exhibit rich sets of enstatite-dominated crystalline silicate emission features. IRAS 16456-3542 is extremely rich in crystalline silicates, with >90% of its silicate mass in crystalline form, the highest to date ever reported for crystalline silicate sources.

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