Dust models & IR spectroscopy obs. of AGB stars

Many emission features remain unidentified in the infrared spectra of asymptotic giant branch (AGB) stars. In particular, features at ~11, 20, 28, and 32{mu}m have been noted in...在渐近巨星分支（asymptotic giant branch, AGB）恒星的红外光谱中，仍有诸多发射特征尚未得到证认。尤为值得注意的是，波长约11、20、28与32微米处的谱特征已被相关观测记录。