High Spatial Resolution Spectroscopy of W51 IRS 2E and IRS 2W: Two Very Massive Young Stars in Early Formation Stages
High Spatial Resolution Spectroscopy of W51 IRS 2E and IRS 2W: Two Very Massive Young Stars in Early Formation Stages
复制标题
W51 IRS 2E 和 IRS 2W 的高空间分辨率光谱：两颗处于早期形成阶段的巨大质量年轻恒星
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
E. Figuerêdo
中科院分区：
文献类型：
--
作者：
C. Barbosa;R. Blum;P. Conti;A. Damineli;E. Figuerêdo
我们给出了与超致密H II区W51d有关的IRS2E和IRS2W的近红外对应的K波段光谱，这两个源都嵌入了银河系致密的H II区W51IRS 2。高空间分辨率的观测是利用安装在双子座北天文台的激光导星设备和近红外积分场光谱仪获得的。W51d的电离源光谱显示出光球层的特征：N III(21155？)发射，He II(21897？)吸收，这使得我们将其归类为年轻的O3型恒星。我们在IRS2E的光谱中探测到了23000ä发射的CO泛音，这表明它是一个仍然被吸积盘包围的大质量年轻天体，可能正在从热核相过渡到超致密的H II区。
We present K-band spectra of the near infrared counterparts to IRS 2E and IRS 2W which is associated with the ultracompact H II region W51d, both of them embedded sources in the Galactic compact H II region W51 IRS 2. The high spatial resolution observations were obtained with the laser guide star facility and Near-infrared Integral Field Spectrograph (NIFS) mounted at the Gemini-North observatory. The spectrum of the ionizing source of W51d shows the photospheric features N III (21155 Å) in emission and He II (21897 Å) in absorption which lead us to classify it as a young O3 type star. We detected CO overtone in emission at 23000 Å in the spectrum of IRS 2E, suggesting that it is a massive young object still surrounded by an accretion disk, probably transitioning from the hot core phase to an ultracompact H II region.