IRAS 19227+1700:富碳星还是富氧星?  

IRAS 19227+1700: Carbon-rich or Oxygen-rich Star?

作　　者：陈培生[1,2] 何金华[1,2] 汪洵浩[1,2] 

机构地区：[1]中国科学院国家天文台云南天文台,昆明650011 [2]中国科学院光学天文联合开放实验室,北京100012

出　　处：《天文学报》2003年第1期3-7,共5页Acta Astronomica Sinica

基　　金：国家自然科学基金资助项目

摘　　要：IRAS 19227+1700作为富碳星列于新版碳星星表中,然而该星在IRAS红外双色图上处于典型的有较厚富氧拱星包层区域中,而不处于硅酸盐碳星通常所处的区域,而且有证据表明该星不但有主线和伴线羟基脉泽发射,还有靠近中心星的水脉泽发射,其IRAS LRS谱在9-12μm范围有尘埃发射特征,近红外的观测又证实它确实存在热的拱星包层,因此IRAS 19227+1700的拱星包层应该全是富氧性质的,它的中心星是富氧的可能性也极大。IRAS 19227+1700 is listed as a carbon star in the new carbon star catalog. However, this star is located in the region of the stars with rather thick oxygen-rich envelopes, but not in the typical region of the silicate carbon stars in the IRAS two-color diagram. Futhermore, there are evidences that IRAS 19227+1700 has not only the main line and satellite line OH maser emissions, but also the water maser emission which is close to the central star. The IRAS low-resolution spectrum of the star shows dust emission feature in the range of 9-12μm, and the near infrared. The observations verify that it has a hot circumstellar envelope. Therefore the envelope of IRAS 19227+1700 should be full oxygen-rich and it is very likely that the central star of it is also oxygen-rich.

关 键 词：富碳星 富氧星 恒星 射电线 拱星包层 化学丰度 光谱 

分 类 号：P144[天文地球—天体物理]