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JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
R. Wesson, Mikako Matsuura, Albert A. Zijlstra +18
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6m to 25 m. The bright shell is strongly fragmented with som…
ALMA Compact Array observations of the Fried Egg nebula: Evidence for large-scale asymmetric mass-loss from the yellow hypergiant IRAS 17163-3907
Sofia Wallstrom, E. Lagadec, S. Muller +12
Yellow hypergiants are rare and represent a fast evolutionary stage of massive evolved stars. That evolutionary phase is characterised by a very intense mass loss, the understandin…
On the properties of dust and gas in the environs of V838 Monocerotis
K. M. Exter, N. L. J. Cox, B. M. Swinyard +4
Herschel FIR imaging and spectroscopy were taken at several epochs to probe the central point source and the extended environment of V838 Mon. PACS and SPIRE maps were used to obta…
Constraints on the H2O formation mechanism in the wind of carbon-rich AGB stars
R. Lombaert, L. Decin, P. Royer +13
Context. The recent detection of warm HO vapor emission from the outflows of carbon-rich asymptotic giant branch (AGB) stars challenges the current understanding of circumstell…
Polycyclic aromatic hydrocarbons and molecular hydrogen in oxygen-rich planetary nebulae: the case of NGC6720
N. L. J. Cox, P. Pilleri, O. Berne +2
Evolved stars are primary sources for the formation of polycyclic aromatic hydrocarbons (PAHs) and dust grains. Their circumstellar chemistry is usually designated as either oxygen…
Dusty wind of W Hya. Multi-wavelength modelling of the present-day and recent mass-loss
T. Khouri, L. B. F. M. Waters, A. de Koter +5
Low- and intermediate-mass stars go through a period of intense mass-loss at the end of their lives in a phase known as the asymptotic giant branch (AGB). During the AGB a signific…