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2007MNRAS.380.1161L - Mon. Not. R. Astron. Soc., 380, 1161-1171 (2007/September-3)
The formation of a detached shell around the carbon star Y CVn.
LIBERT Y., GERARD E. and LE BERTRE T.
Abstract (from CDS):
We present a model in which the detached shell results from the slowing down of the stellar wind by surrounding matter. The inner radius corresponds to the location where the stellar outflow is abruptly slowed down from ∼8 to 2 km/s (termination shock). The outer radius corresponds to the location where external matter is compressed by the expanding shell (bow shock). In this model, the mass-loss rate of YCVn has been set constant, at the same level of 1.0x10–7M☉/yr, for ∼4.5x105 yr. The gas temperature varies from ∼1800 K at the inner limit to 165 K at the interface between circumstellar matter and external matter.
Our modelling shows that the presence of a detached shell around an asymptotic giant branch star may not mean that a drastic reduction of the mass-loss rate has occurred in the past. The inner radius of such a shell might only be the effect of a termination shock rather than of an interruption of the mass-loss process.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): stars: AGB and post-AGB - stars: carbon - circumstellar matter - stars: individual: Y CVn - stars: mass-loss - radio lines: stars
Simbad objects: 8
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