| Issue |
A&A
Volume 368, Number 3, March IV 2001
|
|
|---|---|---|
| Page(s) | L34 - L37 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20010211 | |
| Published online | 15 March 2001 | |
SiO emission from a huge, detached shell in IRC +10420 *
1
Observatorio Astronómico Nacional (IGN), Apdo. 1143, 28800 Alcalá de Henares, Spain e-mail: (bujarrabal,colomer,j.alcolea)@oan.es
2
IRAM, 300 rue de la Piscine, 38406 St Martin d'Hères, France e-mail: lucas@iram.fr
Corresponding author: A. Castro-Carrizo, carrizo@oan.es
Received:
28
November
2000
Accepted:
6
February
2001
We present observations of the 
-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 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.
Key words: stars: individual: IRC +10420 / (stars:) circumstellar matter / stars: AGB y post-AGB / radio lines: stars / stars: mass-loss
© ESO, 2001
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