Adjusting the bow-tie: A morpho-kinematic study of NGC40

Abstract

We present a comprehensive study of the ionization structure and kinematics of the planetary nebula (PN) NGC40 (a.k.a. the Bow-tie Nebula). A set of narrow-band images obtained with the ALhambra Faint Object Spectrograph and Camera (ALFOSC) at the Nordic Optical Telescope (NOT) are used to study the turbulent distribution of gas in the main cavity, the ionization stratification and the density of this PN. High-resolution Manchester Echelle Spectrograph (MES) observations obtained at 2.1m telescope of the San Pedro Mártir (SPM) Observatory are used to unveil in great detail the kinematic signatures of all morphological features in NGC40. The images and spectra suggest that NGC40 had multiple mass ejections in its recent formation history. We found 4 jet-like ejections not aligned with the main axis of NGC40 (PA=20${}^{\circ }$), some of them having pierced the main cavity along the SW-NE direction as well as the southern lobe. Using a tailor-made morpho-kinematic model of NGC40 produced with SHAPE we found that the main cavity has a kinematic age of 6,500 yr and the two pairs of lobes expanding towards the N and S directions have an averaged age of 4,100$\pm$550 yr. NGC40 thus adds to the group of PNe with multiple ejections along different axes that challenge the models of PN formation.

11 pages, 9 figures, 3 tables; Accepted to MNRAS

References in corpus (14)

• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• Catalogue of central stars of planetary nebulae: Expanded edition
• Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634
• Formation and X-ray Emission from Hot Bubbles in Planetary Nebulae. II. Hot bubble X-ray emission
• X-ray emission from Planetary Nebulae. I. Spherically symmetric numerical simulations
• Expansion of hydrogen-poor knots in the born-again planetary nebulae A30 and A78
• Tomography of the unique on-going jet in the planetary nebula NGC 2392
• Rings and arcs around evolved stars. II. The Carbon Star AFGL 3068 and the Planetary Nebulae NGC 6543, NGC 7009 and NGC 7027
• The Halo and Rings of the Planetary Nebula NGC 40 in the Mid-Infrared
• Hidden IR structures in NGC 40: signpost of an ancient born-again event
• The interaction of the halo around the butterfly planetary nebula NGC650-1 with the interstellar medium
• Catching a Grown-Up Starfish Planetary Nebula: I. Morpho-Kinematical study of PC 22
• Parasite common envelope evolution by triple-star systems
• The five axes of the Turtle: symmetry and asymmetry in NGC 6210