Spectral variations of carbon stars based on ISO SWS data

作     者：Xiao-Hong Yang Pei-Sheng Chen 

作者机构：Department of Physics Chongqing University Chongqing 400044 China National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2009年第9卷第12期

页      面：1359-1367页

核心收录：

学科分类：0810[工学-信息与通信工程] 081702[工学-化学工艺] 0709[理学-地质学] 08[工学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 081002[工学-信号与信息处理] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.10803023) supported by the Natural Science Foundation Project of CQ CSTC(No.2008BB0153) 

主　　题：stars: AGB and post AGB    stars: mass loss    infrared: stars 

摘      要：We investigate the spectral variations of seven carbon stars in the infrared using ISO SWS spectral data. Continuum variations of those carbon stars show that during the central star pulsations when carbon stars become fainter in the infrared, their ISO SWS spectra become redder and the near-IR temperature （Tnir） decreases. When carbon stars become brighter in the infrared, their ISO SWS spectra become bluer and Tnir increases. Furthermore, it is found that the shorter 1abe wavelength of spectral features, such as the 2.48＋2.58 （C2H2＋HCN＋CO＋C2）, 3.05 （C2H2＋HCN） and 3.90 （C2H2） μm features, is, the better the correlation of their relative integrated fluxes with the fluxes of the continuum is. The changes of the 5.2 （C3）, 11.30 （SIC） and 13.70 （C2H2）μm features do not obviously correlate with the fluxes of the continuum.