Hen 2-104: A close-up look at the Southern Crab

Abstract

The kinematics, shaping, density distribution, expansion distance, and ionized mass of the nebula Hen 2-104, and the nature of its symbiotic Mira are investigated. A combination of multi-epoch HST images and VLT integral field high-resolution spectroscopy is used to study the nebular dynamics both along the line of sight and in the plane of the sky. These observations allow us to construct a 3-D spatio-kinematical model of the nebula, which together with the measurement of its apparent expansion in the plane of the sky over a period of 4 years, provides the expansion parallax for the nebula. The integral field data featuring the [S{\sc ii}] $\lambda \lambda$671.7,673.1 emission line doublet provide us with a density map of the inner lobes of the nebula, which together with the distance estimation allow us to estimate its ionized mass. We find densities ranging from n${}_e$=500 to 1000 cm${}^{-3}$ in the inner lobes and from 300 to 500cm${}^{-3}$ in the outer lobes. We determine an expansion parallax distance of 3.3$\pm$0.9 kpc to Hen 2-104, implying an unexpectedly large ionized mass for the nebula of the order of one tenth of a solar mass.

arXiv comment11 pages, 12 figures, accepted for publication in A&A

References in corpus (8)

• A three-dimensional Galactic extinction model
• HST Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution
• Mass-Losing Semiregular Variable Stars in Baade's Windows
• On expansion parallax distances for planetary nebulae
• Collimated Outflow Formation via Binary Stars. 3-D Simulations of AGB Wind and Disk Wind Interactions
• Menzel 3: Dissecting the ant
• Internal and external shock fronts in He2-104
• Physical conditions in the O++ zone from ISO and HST data. NGC 6543 revisited

Cited by in corpus (17)

• THELI -- Convenient reduction of any optical, near- and mid-infrared imaging data
• A catalogue of integrated H-alpha fluxes for 1,258 Galactic planetary nebulae
• The long-period binary central stars of the planetary nebulae NGC 1514 and LoTr 5
• A morpho-kinematic and spectroscopic study of the bipolar nebulae: M 2-9, Mz 3, and Hen 2-104
• Abell 41: shaping of a planetary nebula by a binary central star?
• Multi-wavelength diagnostic properties of Galactic Planetary Nebulae detected by GLIMPSE-I
• New Young Planetary Nebulae in IPHAS
• The influence of binarity on dust obscuration events in the planetary nebula M 2-29 and its analogues
• The Discovery of Infrared Rings in the Planetary Nebula NGC 1514 During the WISE All-Sky Survey
• Opening PANDORA's box: APEX observations of CO in PNe
• Symbiotic stars in X-rays II: faint sources detected with XMM-Newton and Chandra
• A D'-type symbiotic binary in the planetary nebula SMP LMC 88
• K 3-22: a D-type symbiotic star
• DT Serpentis: neither a symbiotic star nor a planetary nebula associate
• The morpho-kinematical structure and chemical abundances of the complex planetary nebula NGC 1514
• Morphological study of the nested planetary nebula Hubble 12
• Discovery of a planetary nebula surrounding the symbiotic star DT Serpentis