中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Molecular and dust features of 29 SiC carbon AGB stars

文献类型:期刊论文

作者Yang XH(杨孝鸿); Chen PS(陈培生); He JH(何金华)
刊名ASTRONOMY & ASTROPHYSICS
出版日期2004-02
卷号414期号:3页码:1049-1063
关键词star : carbon stars star : AGB-infrared spectra-ISO
ISSN号0004-6361
产权排序第一完成单位
通讯作者Yang, XH (reprint author), Chinese Acad Sci, Natl Astron Observ Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
英文摘要We have reduced and analyzed the Infrared Space Observatory (ISO) Short-Wavelength Spectrometer (SWS) spectra of 29 infrared carbon stars with a silicon carbide feature at 11.30 mum, 17 of which have not been previously published. Absorption or emission features of C-2, HCN, C2H2, C-3 and silicon carbide (SiC) have been identified in all 17 unpublished carbon stars. In addition, two unidentified absorption features at 3.50 and 3.65 mum are listed for the first time in this paper. We classify these 29 carbon stars into groups A, B, C and D according to the shapes of their spectral energy distribution, and this classification seems to show an evolutionary sequence of carbon stars with an SiC feature. Moreover we have found the following results for the different groups: on average, the relative integrated flux of the 3.05 mum C2H2+HCN absorption feature increases gradually from group A to B and C; that of the 5.20 mum C-3 absorption feature becomes gradually weaker from group A to B and C; that of the 11.30 mum SiC emission feature increases gradually from group A to B and C but weakens in group D; and in contrast, that of the 13.70 mum C2H2 absorption feature weakens gradually from group A to B and C but becomes stronger in group D. We suggest that the evolution of the IR spectra of carbon stars along the sequence A to D is a result of the following phenomena: as the near-IR black-body temperature (T-nir) decreases, the circumstellar envelope becomes thicker; also the effective temperature (T-eff) of the photosphere of the central star decreases gradually and the C/O ratio increases from A to B.
WOS标题词Science & Technology ; Physical Sciences
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]LOW-RESOLUTION SPECTRA ; ISO-SWS SPECTRA ; INFRARED-SPECTRA ; CIRCUMSTELLAR SHELLS ; MODEL ATMOSPHERES ; IRAS ; RICH ; EVOLUTION ; VARIABLES
收录类别SCI ; EI
原文出处http://www.aanda.org/articles/aa/abs/2004/06/aah4223/aah4223.html
语种英语
WOS记录号WOS:000189377200029
源URL[http://ir.ynao.ac.cn/handle/114a53/4181]  
专题云南天文台_其他
作者单位National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, 650011, PR China
推荐引用方式
GB/T 7714
Yang XH,Chen PS,He JH. Molecular and dust features of 29 SiC carbon AGB stars[J]. ASTRONOMY & ASTROPHYSICS,2004,414(3):1049-1063.
APA Yang XH,Chen PS,&He JH.(2004).Molecular and dust features of 29 SiC carbon AGB stars.ASTRONOMY & ASTROPHYSICS,414(3),1049-1063.
MLA Yang XH,et al."Molecular and dust features of 29 SiC carbon AGB stars".ASTRONOMY & ASTROPHYSICS 414.3(2004):1049-1063.

入库方式: OAI收割

来源:云南天文台

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