文章基本信息

标题：The 21-μm and 30-μm circumstellar dust features in evolved C-rich objects
本地全文：下载
作者：B. W. Jiang ; Ke Zhang ; Aigen Li 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2010
卷号：62
期号：1
页码：105-110
DOI：10.5047/eps.2008.12.004
出版社：Springer Verlag
摘要：The 21-μm and 30-μm bands are the strongest dust emission features detected in evolved low- and intermediate-mass C-rich stars (i.e.asymptotic giant branch (AGB) stars, proto-planetary nebulae (PPNe), and planetary nebulae (PNe)).While the 21-μm feature is rare and exists only in the transient PPN phase, the 30-μm feature is more common and seen in the entire late stage of stellar evolution, from AGB to PPN and PN phases, as well as in the low-metallicity galaxies: the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC).The carriers of these features remain unidentified.All the 21-μm sources also emit in the 30-μm band, suggesting that their carriers may be somewhat related.
关键词：AGB stars ;post-AGB stars ;circumstellar dust ;infrared