Hostname: page-component-cb9f654ff-mwwwr Total loading time: 0 Render date: 2025-08-03T07:59:44.989Z Has data issue: false hasContentIssue false
  • English
  • Français

The neutral envelopes around AGB and post-AGB objects

Circumstellar Molecules

Published online by Cambridge University Press:  25 May 2016

H. Olofsson
H. Olofsson*
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden

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.

The circumstellar gas/dust envelopes of stars on and beyond the asymptotic giant branch harbor an impressive number of different molecular species and their isotopic variants. Some of these molecules are of photospheric origin, but the majority have been produced through various chemical processes in the envelope. This chemistry depends primarily on the chemical composition of the gas (i.e., C/O<1 or >1), but the conditions also change as the central star evolves. In this review we present circumstellar molecular abundance and isotope ratio estimates, and discuss how they can be used in the study of the late evolution of stars, which in extreme cases may become heavily obscured.

Information

Type
Stars and Circumstellar Envelopes
Information
Symposium - International Astronomical Union , Volume 178: Molecules in Astrophysics: Probes and Processes , 1997 , pp. 457 - 468
Copyright
Copyright © Kluwer 1997 

References

Avery, L.W., Amano, T., Bell, M.B., et al. 1992, ApJS 83, 363.CrossRefGoogle Scholar
Bachiller, R., Planesas, P., Martín-Pintado, J., Bujarrabal, V., Tafalla, M. 1989, A&A 210, 366.Google Scholar
Bachiller, R., Fuente, A., Bujarrabal, V., et al. 1996, A&A, in press.Google Scholar
Bakker, E.J., van Dishoeck, E.F., Waters, L.B.F.M., Schoenmaker, T. 1996, A&A, in press.Google Scholar
Bieging, J.H., Latter, W.B. 1994, ApJ 422, 765.CrossRefGoogle Scholar
Bujarrabal, V., Gómez-González, J., Bachiller, R., Martin-Pintado, J. 1988, A&A 204, 242.Google Scholar
Bujarrabal, V., Fuente, A., Omont, A. 1994a, A&A 285, 247.Google Scholar
Bujarrabal, V., Fuente, A., Omont, A. 1994b, ApJ 421, L47.CrossRefGoogle Scholar
Cernicharo, J., Guélin, M. 1987, A&A 183, L10.Google Scholar
Cernicharo, J., Guélin, M. 1996, A&A 309, L27.Google Scholar
Cox, P., Omont, A., Huggins, P.J., Bachiller, R., Forveille, T. 1992, A&A 266, 420.Google Scholar
Deguchi, S., Izumiura, H., Nguyen-Q-Rieu, , Shibata, K.M., Ukita, N., Yamamura, I. 1992, ApJ 392, 597.CrossRefGoogle Scholar
Forestini, M., Guélin, M., Cernicharo, J. 1996, A&A, in press.Google Scholar
Fukasaku, S., Hirahara, Y., Masuda, A., et al. 1994, ApJ 437, 410.CrossRefGoogle Scholar
Groesbeck, T.D., Phillips, T.G., Blake, G.A. 1994, ApJS 94, 147.CrossRefGoogle Scholar
Guélin, M., Cernicharo, J., Paubert, G., Turner, B.E., 1990, A&A 230, L9.Google Scholar
Guélin, M., Lucas, R., Cernicharo, J. 1993, A&A 280, L19.Google Scholar
Guélin, M., Forestini, M., Valiron, P., et al. 1995, A&A 297, 183.Google Scholar
Huggins, P.J., Olofsson, H., Johansson, L.E.B. 1988, ApJ 332, 1009.CrossRefGoogle Scholar
Johnson, H.R., Ensman, L.M., Alexander, D.R., et al. 1995, ApJ 443, 281.CrossRefGoogle Scholar
Kahane, C., Gómez-González, J., Cernicharo, J., Guélin, M. 1988, A&A 190, 167.Google Scholar
Kahane, C., Cernicharo, J., Gómez-González, J., Guélin, M. 1992, A&A 256, 235.Google Scholar
Kastner, J. 1992, ApJ 401, 337.CrossRefGoogle Scholar
Kawaguchi, K., Kasai, Y., Ishikawa, S., Kaifu, N. 1995, PASJ 47, 853.Google Scholar
Lindqvist, M., Olofsson, H., Winnberg, A., Nyman, L-Å. 1992, A&A 263, 183.Google Scholar
Mamon, G.A., Glassgold, A.E., Huggins, P.J. 1988, ApJ 328, 797.CrossRefGoogle Scholar
Nyman, L-Å., Olofsson, H., Johansson, L.E.B., Booth, R.S., Carlström, U., Wolstencroft, R. 1993, A&A 269, 377.Google Scholar
Olofsson, H. 1994, in Circumstellar Media in The Last Stages of Stellar Evolution, eds Clegg, R.E.S., Stevens, I. R., Meikle, W.P.S. (Cambridge University Press, Cambridge), p. 246.CrossRefGoogle Scholar
Olofsson, H. 1997, in The Carbon Star Phenomenon, IAU Symposium 177, ed. Wing, R., (Kluwer, Dordrecht), in press.Google Scholar
Olofsson, H., Eriksson, K., Gustafsson, B., Carlström, U. 1993, ApJS 87, 305.CrossRefGoogle Scholar
Olofsson, H., Bergman, P., Eriksson, K., Gustafsson, B. 1996, A&A 311, 587.Google Scholar
Olofsson, H., Lindqvist, M., Nyman, L-Å., Winnberg, A. 1997, in prep.Google Scholar
Omont, A., Lucas, R., Morris, M., Guilloteau, S. 1993, A&A 267, 490.Google Scholar
Sahai, R., Wootten, A., Schwarz, H.E., Wild, W. 1994, ApJ 428, 237.CrossRefGoogle Scholar
Solomon, P., Jefferts, K.B., Penzias, A.A., Wilson, R.W. 1971, ApJ 163, L53.CrossRefGoogle Scholar
Truong-Bach, , Morris, D., Nguyen-Q-Rieu, , Deguchi, S. 1990, A&A 230, 431.Google Scholar
Turner, B.E., Steimle, T.C., Meerts, L. 1994, ApJ 426, L97.CrossRefGoogle Scholar
Ziurys, L.M., Apponi, A.J., Guélin, M., Cernicharo, J. 1995, ApJ 445, L47.CrossRefGoogle Scholar