Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-14T09:27:54.244Z Has data issue: false hasContentIssue false
  • English
  • Français

Probing chemical processes in AGB stars

Published online by Cambridge University Press:  01 February 2008

Fredrik L. Schöier  and
Hans Olofsson
Fredrik L. Schöier
Affiliation:
Onsala Space Observatory, SE-439 92 Onsala, Sweden email: schoier@chalmers.se, hans.olofsson@chalmers.se
Hans Olofsson
Affiliation:
Onsala Space Observatory, SE-439 92 Onsala, Sweden email: schoier@chalmers.se, hans.olofsson@chalmers.se
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We are conducting multi-transition observations of circumstellar line emission from common molecules such as HCN, SiO, CS, SiS and CN for a large sample of AGB stars with varying photospheric C/O-ratios and mass-loss charachteristics. Our recently published results for SiO and SiS clearly show that major constraints on the relative roles of non-equilibrium chemistry, dust condensation, and photodissociation can be obtained from the study of circumstellar molecular line emission. Presented here are also preliminary results based on detailed radiative transfer modelling of HCN line emission.

Keywords

Stars: AGB and post-AGBcircumstellar mattermass loss
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 201 - 206
Copyright
Copyright © International Astronomical Union 2008

References

Bieging, J. H., Shaked, S., & Gensheimer, P. D. 2000, ApJ, 543, 897CrossRefGoogle Scholar
Cherchneff, I. 2006, A&A, 456, 1001Google Scholar
Duari, D., Cherchneff, I., & Willacy, K. 1999, A&A (Letters), 341, L47Google Scholar
Ford, et al. 2004, ApJ, 614, 990Google Scholar
Gonzalez Delgado, D., et al. 2003, A&A, 411, 123Google Scholar
Gustafsson, B. 2004, in EAS Publications Series, 21–50CrossRefGoogle Scholar
Hasegawa, T., Kwok, S., Koning, N., et al. 2006, ApJ, 637, 791CrossRefGoogle Scholar
Marvel, K. B. 2005, AJ, 130, 261Google Scholar
Melnick, G. J., et al. 2001, Nature, 412, 160CrossRefGoogle Scholar
Millar, T. 2003, in: Habing, H. J. & Olofsson, H. (eds.), Asymptotic giant branch stars, (Astronomy and astrophysics library, New York, Berlin: Springer), p. 247Google Scholar
Olofsson, H., Gonzlez-Delgado, D., Kerschbaum, F., & Schöier, F. L. 2002, A&A, 391, 1053Google Scholar
Ramstedt, S., Schöier, F. L., Olofsson, H., & Lundgren, A. A. 2006, A&A (Letters), 454, L103Google Scholar
Schöier, F. L., Bast, J., Olofsson, H., & Lindqvist, M. 2007, A&A, 473, 871Google Scholar
Schöier, F. L., Fong, D., Olofsson, H., Zhang, Q., & Patel, N. 2006b, ApJ, 649, 965Google Scholar
Schöier, F. L., & Olofsson, H. 2001, A&A, 368, 969Google Scholar
Schöier, F. L., Olofsson, H., & Lundgren, A. A. 2006a, A&A, 454, 247Google Scholar
Schöier, F. L., Olofsson, H., Wong, T., Lindqvist, M., & Kerschbaum, F. 2004, A&A, 422, 651Google Scholar
Willacy, K. 2004, ApJ (Letters), 600, L87CrossRefGoogle Scholar