摘要
利用ＩＲＡＳ低分辨率光谱（ＬＲＳ）观测资料，从近２０００个具有１６１２ＭＨｚＯＨ发射的ＩＲＡＳ源中，发现９个具有碳化硅特征拱星壳层的ＯＨ／ＩＲ星的候选者．进一步的研究表明其中的６个确实或极有可能既是显示１１．３μｍ碳化硅发射特征的碳星。
In the latter classifications of IRAS Low Resolution Spectra(LRS), 9 candidates of OH/IR stars with SiC circumstellar envelopes are selected out from nearly 2000 known IRAS sources with OH maser emission at 1612MHz. Further studies are made in two aspects: reidentification of the candidate samples with corresponding OH maser sources, and reexamination of these samples with their carbon rich features. Then it is shown that 4 samples, i.e. IRAS 04130+3918, 05373-0810, 06238+0904 and 18551+0323, are actually OH/IR stars with OH emission at 1612MHz as well as carbon stars with SiC emission at 11.3μm, another 2 sources IRAS 08304-4313 and 17371-3021 are very possibly objects of the same type, but the rest 3 stars(IRAS 16458-4425, 17209-3318 and 17445-3128) need to be investigated still further. Thus it seems that besides oxygen rich stars, some carbon rich stars can also display OH maser emission. A brief discussion of the evolution status of this peculiar type of AGB stars is also presented in this paper.
出处
《天文学报》
CSCD
北大核心
1999年第2期174-182,共9页
Acta Astronomica Sinica
基金
国家自然科学基金
中国科学院基础研究重点基金
