论文标题
发现失控的HD 185806后面的光学茧尾
Discovery of an optical cocoon tail behind the runaway HD 185806
论文作者
论文摘要
关于进化恒星周围结构的研究提供了有关母恒星演变和局部星际介质的特性的重要信息。在这项工作中，我们介绍了Star HD 185806后面的光学茧尾的发现和表征。茧顶的发射令人困惑，因为它在红外线中被检测到，但在光波长中没有显示信号。 Nebular结构的H-Alpha和[OIII]通量从2.7到8.5x10^{ - 12} ERG S^{ - 1} CM^{-2} {-2}，从0.9到7.0x10^{ - 13} erg S^{ - 1} CM^{-1} CM^{-1} CM^{-1} cm^{ - 2}。通过高分辨率光谱学，我们得出了恒星的光谱类型，构建了H-Alpha的茧尾的位置图，[OIII]和[NII]发射线，并确定其在-100至40至40 km S ^{ - 1}范围内的速度。此外，在RGB和早期AGB阶段之间的过渡阶段中，我们使用采用900 pc的SED拟合和台面进化模型，并将HD 185806分为1.3 m Star。最后，我们使用天文软件形状研究了茧尾的形态型结构。发现相对于天空平面的椭圆形结构，可以更好地再现观察到的HD 185806的茧尾。
Studies on the circumstellar structures around evolved stars provide vital information on the evolution of the parent star and the properties of the local interstellar medium. In this work, we present the discovery and characterization of an optical cocoon tail behind the star HD 185806. The cocoon apex emission is puzzling, as it is detected in the infrared but shows no signal in the optical wavelength. The H-alpha and [OIII] fluxes of the nebular structure vary from 2.7 to 8.5x10^{-12} erg s^{-1} cm^ {-2} and from 0.9 to 7.0x10^{-13} erg s^{-1} cm^{-2}, respectively. Through high-resolution spectroscopy, we derive the spectral type of the star, construct the position-velocity diagrams of the cocoon tail for the H-alpha, [OIII] and [NII] emission lines, and determine its velocity in the range of -100 to 40 km s ^{-1} . Furthermore, we use SED fitting and MESA evolutionary models adopting a distance of 900 pc, and classify HD 185806 as a 1.3 M star, in the transition phase between the RGB and early AGB stages. Finally, we study the morpho-kinematic structure of the cocoon tail using the astronomical software SHAPE. An ellipsoidal structure, with an inclination of 19 degrees with respect to the plane of sky is found to better reproduce the observed cocoon tail of HD 185806.
