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27 April 2024 |
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Hen 2-104: A close-up look at the Southern Crab | | M. Santander-Garcia
; R. L. M. Corradi
; A. Mampaso
; C. Morisset
; U. Munari
; M. Schirmer
; B. Balick
; M. Livio
; | | Date: |
4 Mar 2008 | | 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}] $lambdalambda$671.7,673.1 emission line
doublet provide us with a density map of the inner lobes of the nebula, which
together with the distance estimation allow us to estimate its ionized mass. We
find densities ranging from n$_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. | | Source: | arXiv, 0803.0448 | | Services: | Forum | Review | PDF | Favorites | |
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