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

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

2008-03-04

arxiv.org/abs/0803.0448v1

Astronomy and Astrophysics

Astrophysics

11 pages, 12 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20079212

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.

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