论文标题
旋转，膨胀和线扩展对富含氧气的AGB恒星R HYA内CSE的形态界面的贡献
Contributions of rotation, expansion and line broadening to the morpho-kinematics of the inner CSE of oxygen-rich AGB star R Hya
论文作者
论文摘要
我们使用CO（2-1）和SIO（5-4）AGB星R Hya的分子线排放的档案ALMA观察，以说明在某些〜70 AU（〜0.5 0.5 Arcsec）内的旋转，扩展和线对形态（CSE）的形态和运动学的相对贡献。我们提供了旋转和重要线扩展的证据，以统治内部区域，距离恒星中心约14 au（〜100 mas）。前者大约是一个轴，该轴向北部以西几个程度投射，并且预计旋转速度为几km/s。后者发生在恒星中心的大约7-14 au（50-100 MAS）内，线宽度达到了该区域以外的两倍至三倍。我们建议它是由恒星搏动和对流细胞颗粒引起的冲击引起的。我们显示了在讨论旋转并评估旋转速度的径向依赖性时正确考虑观察到的线扩展的重要性。
We use archival ALMA observations of the CO(2-1) and SiO(5-4) molecular line emissions of AGB star R Hya to illustrate the relative contributions of rotation, expansion and line broadening to the morphology and kinematics of the circumstellar envelope (CSE) within some ~70 au (~0.5 arcsec) from the centre of the star. We give evidence for rotation and important line broadening to dominate the inner region, within ~14 au (~100 mas) from the centre of the star. The former is about an axis that projects a few degrees west of north and has a projected rotation velocity of a few km/s. The latter occurs within some 7-14 au (50-100 mas) from the centre of the star, the line width reaching two to three times its value outside this region. We suggest that it is caused by shocks induced by stellar pulsations and convective cell granulation. We show the importance of properly accounting for the observed line broadening when discussing rotation and evaluating the radial dependence of the rotation velocity.
