Silicon in the dust formation zone of IRC +10216
- Autor(en)
- Leen Decin, Jos Cernicharo, Michael J. Barlow, Pierre Royer, Bart Vandenbussche, Roger Wesson, Edward Polehampton, Elvire De Beck, Marcelino Agundez, Jan Blommaert, Martin Cohen, Fabien Daniel, Wim De Meester, Katrina Exter, Helmut Feuchtgruber, José Pablo Fonfria, Walter K Gear, Javier R. Goicoechea, Haley L. Gomez, Martin A. T. Groenewegen, Peter Hargrave, Rik Huygen, Peter Imhof, Rob J. Ivison, Christophe Jean, Franz Kerschbaum, Sarah Jane Leeks, Tanya Lim, Mikako Matsuura, Göran Olofsson, Thomas Posch, Sara Regibo, Giorgio Savini, Bruce Sibthorpe, Bruce M Swinyard, Belén Tercero, Christoffel Waelkens, Dugan K. Witherick, Jeremy Yates
- Abstrakt
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 μm) and SPIRE (194–672 μm) 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 6700 K, while the highest detectable transition is J = 90–89 for SiO, which corresponds to an energy around 8400 K. 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.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Katholieke Universiteit Leuven, Spanish National Research Council (CSIC), University College London, University of Lethbridge, London Metropolitan University, University of California, Berkeley, Max-Planck-Institut für extraterrestrische Physik, Cardiff University, Royal Observatory of Belgium, Blue Sky Spectroscopy, UK Astronomy Technology Centre, Rutherford Appleton Laboratory, Stockholm University, The Royal Observatory, Edinburgh
- Journal
- Astronomy & Astrophysics
- Band
- 518
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201014562
- Publikationsdatum
- 2010
- Peer-reviewed
- Ja
- ÖFOS 2012
- 107003 Geschichte der Naturwissenschaften, 103004 Astrophysik
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/00ba59e0-272d-4496-9321-0b2ab264da57