Molecular and dust features of 29 SiC carbon AGB stars

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	Molecular and dust features of 29 SiC carbon AGB stars
	Yang XH(杨孝鸿); Chen PS(陈培生); He JH(何金华)
刊名	ASTRONOMY & ASTROPHYSICS
	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
通讯作者	Yang, XH (reprint author), Chinese Acad Sci, Natl Astron Observ Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
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 Absorption or emission features of C-2, HCN, C2H2, C-3 and silicon carbide (SiC) have been identified in all 17 unpublished carbon stars.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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
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
内容类型	期刊论文
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.