Bipolar outflow on the Asymptotic Giant Branch - the case of IRC+10011

Details Bipolar outflow on the Asymptotic Giant Branch - the case of IRC+10011 Bipolar outflow on the Asymptotic Giant Branch - the case of IRC+10011

2004-05-09

arxiv.org/abs/astro-ph/0405169v1

Mon.Not.Roy.Astron.Soc. 352 (2004) 852

Astronomy and Astrophysics

Astrophysics

accepted for publication in MNRAS, high-resolution pdf version can be found at http://www.leluya.org/downloads/Vinkovic_et_al_

Scientific paper

10.1111/j.1365-2966.2004.07972.x

Near-IR imaging of the AGB star IRC+10011 (= CIT3) reveals the presence of a bipolar structure within the central ~0.1 arcsec of a spherical dusty wind. We show that the image asymmetries originate from ~1E-4 Msun of swept-up wind material in an elongated cocoon whose expansion is driven by bipolar jets. We perform detailed 2D radiative transfer calculations with the cocoon modeled as two cones extending to ~1,100 AU within an opening angle of ~30deg, imbedded in a wind with the standard r^{-2} density profile. The cocoon expansion started <~200 years ago, while the total lifetime of the circumstellar shell is ~5,500 years. Similar bipolar expansion, at various stages of evolution, has been recently observed in a number of other AGB stars, culminating in jet breakout from the confining spherical wind. The bipolar outflow is triggered at a late stage in the evolution of AGB winds, and IRC+10011 provides its earliest example thus far. These new developments enable us to identify the first instance of symmetry breaking in the evolution from AGB to planetary nebula.

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