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Properties of the circumstellar envelope of the dual chemistry Post-AGB star roberts 22

Epitacio Pereira, DN; de Araujo, FX; Lorenz-Martins, S; Ercolano, B; Barlow, MJ; Bowey, JE; (2007) Properties of the circumstellar envelope of the dual chemistry Post-AGB star roberts 22. In: Kerschbaum, F and Charbonnel, C and Wing, RF, (eds.) ASP Conference Series, Vol. 378, proceedings of the conference:Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes. (pp. pp. 295-296). Astronomical Society of the Pacific: Vienna, Austria. Green open access

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Abstract

A major discovery by the ISO satellite was the presence, in the spectra of many evolved stars, of an array of narrow emission features that could be attributed to crystalline silicate grains in their envelopes tep{molster_dnepcite}. As the circumstellar envelope is formed from the continuous mass loss of the object during the AGB stage, it is natural to suppose that the central star would share its chemical properties. Thus, one would expect a star surrounded by silicate-rich material to be oxygen-rich. However, crystalline silicates are frequently associated with carbon-rich central objects. These dual chemistry objects present an opportunity to investigate the mechanisms of mass ejection that forms the circumstellar envelope during and after the AGB stage and that also contribute to the enrichment of the interstellar medium. We are modeling the dust envelope of Roberts 22, a post-AGB star with dual chemistry, using a Monte Carlo simulation method to describe the radiative transfer in its circumstellar dust envelope.

Type: Proceedings paper
Title: Properties of the circumstellar envelope of the dual chemistry Post-AGB star roberts 22
Event: International Conference on Why Galaxies Care about AGB Stars
Location: Univ Austria, Vienna, AUSTRIA
Dates: 07 August 2006 - 11 August 2006
ISBN-13: 978-1-58381-318-8
Open access status: An open access version is available from UCL Discovery
Publisher version: https://myasp.astrosociety.org/product/CS378/vol-3...
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: Science & Technology, Physical Sciences, Astronomy & Astrophysics, DUST
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 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/10096463
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