论文标题
B [E]星周围的延伸壳的随访
Follow-Up of Extended Shells around B[e] Stars
论文作者
论文摘要
B [e]恒星是不同的B型发射线星，在不同的进化阶段，范围从前序列到中间后序列。由于它们的质量损失和弹出事件，这些物体将大量的质量和能量沉积在其环境中，并用化学处理的材料丰富它，从而极大地有助于其宿主星系的化学和动力学演化。但是，这些神秘的物体的大规模环境并没有引起太多关注。到目前为止，仅报告了B [E]恒星样品周围延伸壳的第一个目录是2001年进行的HA成像调查，仅限于北半球的明亮目标。最近，我们开始了这些目标的后续行动，以检测其在二十年的基线上可能在天空平面上发生的变化。此外，我们将调查扩展到南方目标，并淡淡的北部目标，以补充并完成对B [E]恒星周围大规模喷射的知识。除了在HA和选定的Nebular系中进行成像外，我们还利用整个星云的长缝和3D光谱观测来得出其物理特性。我们发现了另外15个物体附近的明显星云结构，总共有27 B [E]恒星，具有大规模的星云。在这里，我们介绍了三个选定对象的（初步）结果：两个巨大的超级巨头MWC137和MWC 314，以及未分类的B [E] Star MWC 819。
B[e] stars are massive B type emission line stars in different evolutionary stages ranging from pre-main sequence to post-main sequence. Due to their mass loss and ejection events these objects deposit huge amounts of mass and energy into their environment and enrich it with chemically processed material, contributing significantly to the chemical and dynamical evolution of their host galaxies. However, the large-scale environments of these enigmatic objects have not attracted much attention. The first and so far only catalog reporting the detection of extended shells around a sample of B[e] stars was an Ha imaging survey carried out in the year 2001, and was limited to bright targets in the northern hemisphere. We have recently started a follow-up of those targets to detect possible evolution of their nebulae in the plane of the sky over a baseline of two decades. Furthermore, we extend our survey to southern targets and fainter northern ones to complement and complete our knowledge on large-scale ejecta surrounding B[e] stars. Besides imaging in Ha and selected nebular lines, we utilize long-slit and 3D spectral observations across the nebulae to derive their physical properties. We discovered pronounced nebula structures around 15 more objects, resulting in a total of 27 B[e] stars with a large-scale nebula. Here we present our (preliminary) results for three selected objects: the two massive supergiants MWC137 and MWC 314, and the unclassified B[e] star MWC 819.
