H I photodissociation zones around two H II regions in Auriga, Sh 217 and Sh 219
H I photodissociation zones around two H II regions in Auriga, Sh 217 and Sh 219
复制标题
Auriga、Sh 217 和 Sh 219 两个 H II 区域周围的 H I 光解离区
DOI：
10.1086/116618
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
D. Leahy
中科院分区：
文献类型：
--
作者：
R. Roger;D. Leahy
利用广视场DRAO合成望远镜，在21厘米波长的HI线和连续发射谱上绘制了HII区Sharples217和219。这两个区域在电离的外围都有显著的HI区，这表明激发星直接光解了周围的分子气体。在到这两个4.7kpc区域的估计距离上，Sh 217的质量为340M0。电离形式和640M0。在原子气体中，Sh 219由34M0组成。在电离态和86M0。在周围的原子气体中。虽然每个区域的电离主要是由于一颗激发星，但我们在Sh 217中发现了一个较小的发射峰，那就是一对间隔很近的B星
The H II regions Sharpless 217 and 219 have been mapped in H I line and continuum emission at 21 cm wavelength with the wide-field DRAO synthesis telescope. Both regions have prominent H I zones on the peripheries of the ionization indicating direct photodissociation of the surrounding molecular gas by the exciting stars. At the estimated distance to the two regions of 4.7 kpc, Sh 217 comprises a mass of 340 M ○ . in ionized form and 640 M ○ . in atomic gas, while Sh 219 comprises 34 M ○ . in ionized and 86 M ○ . in surrounding atomic gas. Although the ionization of each region is principally due to a single exciting star, we identify a minor peak of emission in Sh 217 with a pair of closely spaced B stars