论文标题
从神秘的高纬度恒星BP PSC及其驾驶源的进化状态的喷气机
Jet from the enigmatic high-latitude star BP Psc and evolutionary status of its driving source
论文作者
论文摘要
BP PSC是一个活跃的晚期(SP:G9)星,其不清楚的进化状态位于高银河纬度$ b = -57^{\ circ} $。它也是准直的双极射流的来源。我们介绍了BP PSC流出的适当运动和径向速度研究的结果,基于档案$Hα$成像,GMOS摄像头在8.1-m Gemini-North望远镜下以及最新的成像和长距离光谱以及Scorpio多模式焦点的最新成像和长距离光谱,以6-m BTA的SAO RAS的6-m BTA TeleScope处。喷气机的3D运动学揭示了完整的空间速度,最高$ \ sim $ \ sim $ 140 km $ \ cdot $ s $ s $^{ - 1} $,并允许我们估计BP PSC系统的距离为$ d = 135 \ pm40 $ PC。此距离导致估计中央源光度$ l _*\ of1.2l _ {\ odot} $,表明它是$ \ $ \ $ \ $ 1.3 $ m _ {\ odot} $ t tauri star,年龄$ t \ t \ lysesim $ 7 myr。我们测量了订单的电子密度$ n_e \ sim10^2 $ cm $^{ - 3} $和平均电离分数$ f \ f \ lib of0.04 $在喷气结中,估计的Ne Lobe中质量损失率的上限为Ne Lobe的上限$ \ dot {m} _ {out} \ oft1.2 \ cdot10^{ - 8} m _ {\ odot} \ cdot yr yr^{ - 1} $。流出的物理特性是低兴奋的YSO喷射的典型特征,并且与其发射和准确的磁中心机制一致。在$Hα$图像中揭示的突出的摇摆模式使我们可以假设在非旋转轨道中存在次要的替代伴侣,并将其最合理的质量估计为$ M_P \ 30m_ {JUP} $。我们得出的结论是,BP PSC是最接近Sun Young Jet-Driver系统的PSC之一,其起源可能与通过在第二个银河象限中扩展Supershells触发的Star组发作有关。
BP Psc is an active late-type (sp:G9) star with unclear evolutionary status lying at high galactic latitude $b=-57^{\circ}$. It is also the source of the well collimated bipolar jet. We present results of the proper motion and radial velocity study of BP Psc outflow based on the archival $Hα$ imaging with the GMOS camera at 8.1-m Gemini-North telescope as well as recent imaging and long-slit spectroscopy with the SCORPIO multi-mode focal reducer at 6-m BTA telescope of SAO RAS. The 3D kinematics of the jet revealed the full spatial velocity up to $\sim$140 km$\cdot$s$^{-1}$ and allows us to estimate the distance to BP Psc system as $D=135\pm40$ pc. This distance leads to an estimation of the central source luminosity $L_*\approx1.2L_{\odot}$, indicating that it is the $\approx$1.3$M_{\odot}$ T Tauri star with an age $t\lesssim$ 7 Myr. We measured the electron density of order $N_e\sim10^2$ cm$^{-3}$ and mean ionization fraction $f\approx0.04$ within the jet knots and estimated upper limit of the mass-loss rate in NE lobe as $\dot{M}_{out}\approx1.2\cdot10^{-8}M_{\odot}\cdot yr^{-1}$. The physical characteristics of the outflow are typical for the low-excitation YSO jets and consistent with the magnetocentrifugal mechanism of its launching and collimation. Prominent wiggling pattern revealed in $Hα$ images allowed us to suppose the existence of a secondary substellar companion in a non-coplanar orbit and estimate its most plausible mass as $M_p\approx 30M_{Jup}$. We conclude that BP Psc is one of the closest to the Sun young jet-driving systems and its origin is possibly related to the episode of star formation triggered by expanding supershells in Second Galactic quadrant.