Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...368l..34c&link_type=abstract
Astronomy and Astrophysics, v.368, p.L34-L37 (2001)
Astronomy and Astrophysics
Astrophysics
15
Stars: Individual: Irc +10420, (Stars:) Circumstellar Matter, Stars: Agb Y Post-Agb, Radio Lines: Stars, Stars: Mass-Loss
Scientific paper
We present observations of the v=0 J=2-1 thermal emission of SiO from the very luminous evolved star IRC +10420, performed with the Plateau de Bure interferometer. Our high-resolution maps show that the emission comes from a huge hollow shell, with a typical radius of ~ 1017 cm, that is expanding at ~ 35 m km s-1}. This surprising result is strengthened by model fitting of the flux distribution, that explains the observations assuming that the width of the shell is not larger than half its typical radius. The origin of this feature is discussed. Figure 2 is only available in electronic form at http://www.edpsciences.org
Alcolea Javier
Bujarrabal Valentin
Castro-Carrizo Arancha
Colomer Francisco
Lucas Robert
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