论文标题
在LBV星$η$ Carinae的近距离环境中成像扩展的打结结构
Imaging the expanding knotty structure in the close environment of the LBV star $η$ Carinae
论文作者
论文摘要
$η$〜汽车是银河系中最大的恒星之一。它在19世纪进行了大规模的喷发，该爆发产生了令人印象深刻的躁郁症状态星云。中央恒星是一个古怪的二进制，年度为5.54 \。尽管尚未直接检测到该伴侣，但它会导致时间变化的电离和碰撞X射线发射。通过表征靠近恒星的弹射器的复杂结构和运动学，我们旨在限制$η$〜汽车的过去和现在的质量损失。 $η$〜汽车在非常大的望远镜处观察到极端自适应光学仪器球，并使用Zimpol摄像头在光学上使用其极化模式。实现了20 \的空间分辨率，即非常接近伴侣恒星的13个Mas Apastron分离。我们检测到恒星内部弧秒内的新结构（2 \，300 \，在2.3 \，kpc距离处）。我们可以通过在30 \年代的时间内跟踪我们的新图像和历史图像的适当动作来将这些结构与1890年附近的喷发联系起来。此外，我们在H $α$线中的恒星内部的200 〜AU中找到了一个风扇形结构，这可能与两颗星的风碰撞区有关。
$η$~Car is one of the most massive stars in the Galaxy. It underwent a massive eruption in the 19th century, which produced the impressive bipolar Homunculus nebula now surrounding it. The central star is an eccentric binary with a period of 5.54\,years. Although the companion has not been detected directly, it causes time-variable ionization and colliding-wind X-ray emission. By characterizing the complex structure and kinematics of the ejecta close to the star, we aim to constrain past and present mass loss of $η$~Car. $η$~Car is observed with the extreme adaptive optics instrument SPHERE at the Very Large Telescope, using its polarimetric mode in the optical with the ZIMPOL camera. A spatial resolution of 20\,mas was achieved, i.e. very close to the presumed 13 mas apastron separation of the companion star. We detect new structures within the inner arcsecond to the star (2\,300\,au at a 2.3\,kpc distance). We can relate these structures to the eruption near 1890 by tracking their proper motions derived from our new images and historical images over a 30\,years time span. Besides, we find a fan-shaped structure in the inner 200~au to the star in the H$α$ line, that could potentially be associated with the wind collision zone of the two stars.
