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Silicon in the dust formation zone of IRC +10216 as observed with PACS and SPIRE on board Herschel

Decin, L; Cernicharo, J; Barlow, MJ; Royer, P; Vandenbussche, B; Wesson, R; Polehampton, ET; ... Yates, JA; + view all (2010) Silicon in the dust formation zone of IRC +10216 as observed with PACS and SPIRE on board Herschel. Astronomy & Astrophysics , 518 , Article L143. 10.1051/0004-6361/201014562. Green open access

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Abstract

The interstellar medium is enriched primarily by matter ejected from evolved low and intermediate mass stars. The outflows from these stars create a circumstellar envelope in which a rich gas-phase and dust-nucleation chemistry takes place. We observed the nearest carbon-rich evolved star, IRC+10216, using the PACS (55-210 {\mu}m) and SPIRE (194-672 {\mu}m) spectrometers on board Herschel. We find several tens of lines from SiS and SiO, including lines from the v=1 vibrational level. For SiS these transitions range up to J=124-123, corresponding to energies around 6700K, while the highest detectable transition is J=90-89 for SiO, which corresponds to an energy around 8400K. Both species trace the dust formation zone of IRC+10216, and the broad energy ranges involved in their detected transitions permit us to derive the physical properties of the gas and the particular zone in which each species has been formed. This allows us to check the accuracy of chemical thermodynamical equilibrium models and the suggested depletion of SiS and SiO due to accretion onto dust grains.

Type: Article
Title: Silicon in the dust formation zone of IRC +10216 as observed with PACS and SPIRE on board Herschel
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/201014562
Publisher version: http://dx.doi.org/10.1051/0004-6361/201014562
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: techniques: spectroscopic / stars: AGB and post-AGB / stars: carbon / circumstellar matter / stars: mass-loss / stars: individual: IRC +10216
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10095306
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