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Newly Identified Silicate Carbon Stars from IRAS Low-Resolution Spectra 被引量:1
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作者 pei-sheng chen Pin Zhang 《Chinese Journal of Astronomy and Astrophysics》 CSCD 2006年第6期697-704,共8页
The discovery of silicate carbon star poses a challenge to the theory of stellar evolution in the late stage, hence it is important to look for more silicate carbon stars. To this end we have carried out cross-identif... The discovery of silicate carbon star poses a challenge to the theory of stellar evolution in the late stage, hence it is important to look for more silicate carbon stars. To this end we have carried out cross-identifications between the new IRAS Low-Resolution Spectrum (LRS) database and the new carbon star catalog, CGCS3. We have found nine new silicate carbon stars with silicate features around 10μm and/or 18 μm. These newly identified stars are located in the Regions Ilia and VII in the IRAS two-color diagram, which means they indeed have typical far infrared colors of silicate carbon stars. The infrared properties of each of these sources are discussed. 展开更多
关键词 STARS AGB and post-AGB - star carbon - infrared STARS
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Infrared spectral evolution of carbon stars
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作者 pei-sheng chen Xiao-Hong Yang Hong-Guang Shan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2010年第4期363-382,共20页
We collected almost all Highly Processed Data Products (HPDP) of ISO SWS01 spectra for the Galactic visual carbon stars,infrared carbon stars,extreme carbon stars and carbon-rich proto-planetary nebulae (PPNs).Tho... We collected almost all Highly Processed Data Products (HPDP) of ISO SWS01 spectra for the Galactic visual carbon stars,infrared carbon stars,extreme carbon stars and carbon-rich proto-planetary nebulae (PPNs).Those infrared spectra are primarily analyzed and discussed.It is shown that either spectral shapes/peaks,or main molecular/dust features are evidenced to change in the sequence of visual carbon stars,infrared carbon stars,extreme carbon stars and carbon-rich PPNs.Statistically,in this sequence,continua are gradually changed from blue to red and locations of spectral peaks of continua are also gradually changed from short wavelengths to long wavelengths.In addition,in this sequence,intensities of main molecular/dust features are also gradually changed from prominent in the short wavelengths to prominent in the long wavelengths.Furthermore,from 2MASS and IRAS photometric data,the sequence is also proved.Results in this paper strongly support the previous suggestion for the evolution sequence of carbon-rich objects in our Galaxy,that is the sequence of visual carbon stars → infrared carbon stars → extreme carbon stars → carbon-rich PPNs. 展开更多
关键词 infrared:stars - stars:carbon - stars:late type
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Spectral variations of carbon stars based on ISO SWS data
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作者 Xiao-Hong Yang pei-sheng chen 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2009年第12期1359-1367,共9页
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 becom... 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. 展开更多
关键词 stars: AGB and post-AGB -- stars: mass loss -- infrared: stars
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