The collimated outflows of the planetary nebula Hu1-2: proper motion and radial velocity measurements

Abstract

Hu\,1-2 is a planetary nebula that contains an isolated knot located northwestern of the main nebula, which could be related to a collimated outflow. We present a subsarcsecond H$\alpha$+[N\,{\sc ii}] image and a high-resolution, long-slit spectrum of Hu\,1-2 that allow us to identify the southeastern counterpart of the northwestern knot and to establish their high velocity ($>$ 340 km\,s${}^{-1}$), collimated bipolar outflow nature. The detection of the northwestern knot in POSS red plates allows us to carry out a proper motion analysis by combining three POSS red plates and two narrow-band H$\alpha$+[N\,{\sc ii}] CCD images, with a time baseline of $\simeq$ 57 yr. A proper motion of 20 $\pm$ 6\,mas\,yr${}^{-1}$ along position angle 312${}^{\circ }$ $\pm$ 15${}^{\circ }$, and a dynamical age of 1375${}^{+590}$\llap{${}_{-320}$}\,yr are obtained for the bipolar outflow. The measured proper motion and the spatio-kinematical properties of the bipolar outflow yield a lower limit of 2.7\,kpc for the distance to Hu\,1-2.

arXiv comment6 pages, 4 figures; accepted for publication in MNRAS

References in corpus (8)

• The Galactic structure and chemical evolution traced by the population of planetary nebulae
• GRAPESPH with Fully Periodic Boundary Conditions: Fragmentation of Molecular Clouds
• Hubble-type outflows of the high-excitation, poly-polar planetary nebula NGC 6302 -- from expansion proper motions
• Morphological and kinematic signatures of a binary central star in the planetary nebula Hu 2-1
• The triple-shell structure and collimated outflows of the planetary nebula NGC 6891
• The high-velocity outflow in the proto-planetary nebula Hen 3-1475
• Measurement of the Distance and Proper Motions of the H2O Masers in the Young Planetary Nebula K 3-35
• Proper Motion and Kinematics of the Ansae in NGC7009

Cited by in corpus (7)

• The Hα surface brightness - radius relation: a robust statistical distance indicator for planetary nebulae
• Space Velocity and Time Span of Jets in Planetary Nebulae
• Hu1-2: a metal-poor bipolar planetary nebula with fast collimated outflows
• Mapping Excitation in the Inner Regions of the Planetary Nebula NGC 5189 using HST WFC3 Imaging
• The expansion proper motions of the extraordinary giant lobes of the planetary nebula KjPn 8 revisited
• Long and short term variability of the possible nascent planetary nebula IRAS 22568+6141: A late thermal pulse?
• The planetary nebula nature and properties of IRAS18197-1118