IFU spectroscopy of southern PN VI: The extraordinary chemo-dynamics of Hen 2-111

Abstract

In this paper we present integral field spectroscopy of the extraordinary Type I bipolar planetary nebula Hen 2-111. In the lobes we map fast moving knots of material with [N II]$\lambda 6584$/H$\alpha$ ratios up to 12, and with radial velocities relative to systemic from -340 km/s up to +390 km/s. We find evidence of a bipolar ejection event at a velocity $\sim 600$ km/s from the central star (assumed to be a binary), which occurred about 8000yr ago. The fast moving material is chemically quite distinct from the lower velocity gas in the bipolar lobes., and displays very high N abundances. We show that the fast moving N-rich knots are not photoionised by the central star, and have constructed detailed shock models for the brightest knot. We find a pre-shock density $\sim 6$cm${}^{-3}$, and a shock velocity $\sim 150$ km/s. The shock is not fully radiative, being only $\sim 600$yr old. This shocked gas is partially H-burnt, with a helium abundance by mass exceeding that of hydrogen, and is interacting with partially H-burnt material ejected in an earlier episode of mass loss. We conclude that the high-velocity material and the bipolar shell must have originated during the late stages of evolution of a common-envelope phase in a close binary system.

arXiv comment15 pages, 14 figures, 2 tables. Accepted for publication in MNRAS

References in corpus (16)

• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• The Wide Field Spectrograph (WiFeS)
• The Wide Field Spectrograph (WiFeS): Performance and Data Reduction
• The Hα surface brightness - radius relation: a robust statistical distance indicator for planetary nebulae
• Effects of Pre-ionisation in Radiative Shocks I: Self-Consistent Models
• PyWiFeS: A Rapid Data Reduction Pipeline for the Wide Field Spectrograph (WiFeS)
• Attenuation caused by a distant Isothermal Turbulent Screen
• Probing AGB nucleosynthesis via accurate Planetary Nebula abundances
• Effects of Pre-ionisation in Radiative Shocks II: Application to the Herbig-Haro Objects
• IFU spectroscopy of southern PNe: III
• Planetary nebulae that cannot be explained by binary systems
• Problems for the WELS classification of planetary nebulae central stars: Self-consistent nebular modelling of four candidates
• Rotating Stars and the Formation of Bipolar Planetary Nebulae II: Tidal Spin-up
• IFU spectroscopy of Southern Planetary Nebulae IV: A Physical Model for IC 418
• The physics and kinematics of the evolved, interacting planetary nebula PN G342.0-01.7
• IFU spectroscopy of Southern Planetary Nebulae V: Low-ionization structures

Cited by in corpus (9)

• MUSE spectroscopy of planetary nebulae with high abundance discrepancies
• Exploring the differences of integrated and spatially resolved analysis using integral field unit data: The case of Abell 14
• IFU spectroscopy of Southern PNe: VII Photo-ionization modelling of intermediate excitation class objects
• The formation of `columns crowns' by jets interacting with a circumstellar dense shell
• Shaping `Ears' in planetary nebulae by early jets
• Chemistry and physical properties of the born-again planetary nebula HuBi 1
• Variable jets at the termination of the common envelope evolution
• The case of NGC 6302: The impact of shocks in the derivation of Nitrogen abundances
• Current Unsolved Problems in Planetary Nebulae Research