论文标题
从狼射线尘埃工厂WR 112分辨出数十年的定期螺旋
Resolving Decades of Periodic Spirals from the Wolf-Rayet Dust Factory WR 112
论文作者
论文摘要
WR 112是一种形成灰尘的富含碳的狼射线（WC）二进制，具有尘土飞扬的星云，表现出复杂的不对称形态，可追溯中央二元碰撞风中的轨道运动和灰尘形成。因此，揭开WR 112周围复杂的脉冲灰尘发射的机会，为了解碰撞的WC二进制文件的粉尘形成过程提供了机会。 In this work, we present a multi-epoch analysis of the circumstellar dust around WR 112 using seven high spatial resolution (FWHM $\sim0.3-0.4''$) N-band ($λ\sim12$ $μ$m) imaging observations spanning almost 20 years and includes newly obtained images from Subaru/COMICS in Oct 2019. In contrast to previous interpretations of a face-on spiral morphology, we observe明确的证据表明，WR 112周围的间隔灰尘的正确运动与$θ_s= 55^\ circ $ aff $ aff $ half-half op-ableant Angle和$ \ sim20 $ -yr期间一致。 WR 112的近边缘几何形状进行了修订，该几何形状对先前的高度可变无线电发射的观察结果与面对面的几何形状不一致。 We estimate a revised distance to WR 112 of $d = 3.39^{+0.89}_{-0.84}$ kpc based on the observed dust expansion rate and a spectroscopically derived WC terminal wind velocity of $v_\infty= 1230\pm260$ km s$^{-1}$.使用新派生的WR 112参数，我们符合光学上的粉尘光谱分配模型，并确定$ \ dot {m} _d = 2.7^{+1.0} _ { - 1.3} \ times10^{ - times10^{ - 6} $ yr $ yr $ yr $ yr $ $^{ - 1} $的尘埃生产速率，yr under，yr ver yes-yr ver yes will已知。
WR 112 is a dust-forming carbon-rich Wolf-Rayet (WC) binary with a dusty circumstellar nebula that exhibits a complex asymmetric morphology, which traces the orbital motion and dust formation in the colliding winds of the central binary. Unraveling the complicated circumstellar dust emission around WR 112 therefore provides an opportunity to understand the dust formation process in colliding-wind WC binaries. In this work, we present a multi-epoch analysis of the circumstellar dust around WR 112 using seven high spatial resolution (FWHM $\sim0.3-0.4''$) N-band ($λ\sim12$ $μ$m) imaging observations spanning almost 20 years and includes newly obtained images from Subaru/COMICS in Oct 2019. In contrast to previous interpretations of a face-on spiral morphology, we observe clear evidence of proper motion of the circumstellar dust around WR 112 consistent with a nearly edge-on spiral with a $θ_s=55^\circ$ half-opening angle and a $\sim20$-yr period. The revised near edge-on geometry of WR 112 reconciles previous observations of highly variable non-thermal radio emission that was inconsistent with a face-on geometry. We estimate a revised distance to WR 112 of $d = 3.39^{+0.89}_{-0.84}$ kpc based on the observed dust expansion rate and a spectroscopically derived WC terminal wind velocity of $v_\infty= 1230\pm260$ km s$^{-1}$. With the newly derived WR 112 parameters we fit optically-thin dust spectral energy distribution models and determine a dust production rate of $\dot{M}_d=2.7^{+1.0}_{-1.3}\times10^{-6}$ M$_\odot$ yr$^{-1}$, which demonstrates that WR 112 is one of the most prolific dust-making WC systems known.
