Abstract
Searches for atomic hydrogen in the circumstellar envelopes produced by mass loss from late-type giants and from planetary nebulae using the 21-cm line have so far proven negative, with the possible exception of the planetary nebula NGC6302. These observations show that the mass shed by red giants is overwhelmingly in molecular form, even for the hotter stars. Comparison between the upper limits and the amount of HI expected to be produced by photodissociation by interstellar UV sets an upper limit of ~ 20,000 years on the age of the envelope around IRC+10216.
Continuum observations of red giants provide a means of investigating mass-loss mechanisms, the presence of companion stars and the formation of planetary nebulae. The available observations suggest that the mass-loss mechanism may be different for cool stars (e.g. IRC+10216) than for hotter stars (e.g. α Ori). They also allow a preliminary estimate of the lifetime of the copious mass loss phase of extreme AGB stars of 20,000 – 30,000 years.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Baud, B., Habing, H.J., Matthews, H.E., and Winnberg, A, 1978, Astr. Ap. Suppl. 36, 193.
Bowers, P.F. 1978, Astr. Ap. Suppl. 31, 127.
Bowers, P.F., Johnston, K.J., and Spencer, J.H. 1983, Ap.J. 274, 733.
Caswell, J.L., and Haynes, R.F. 1975, M.N.R.A.S. 173, 649.
Davis, L.E., Seaquist, E.R., and Purton, C.R. 1979, Ap.J. 230, 434.
Drake, S.A., and Linsky, J.L. 1983, Ap.J. (Letters) 274, L77.
Glassgold, A.E., and Huggins, P.J. 1983, M.N.R.A.S. 203, 517.
Habing, H.J., Goss, W.M., and Winnberg, A. 1982, Astr. Ap. 108, 412.
Hartmann, L., and Avrett, E.H. 1984, Ap.J. (in press).
Hartmann, L., and McGregor, K.B. 1980, Ap.J. 242, 260.
Herman, J. 1983, Ph.D. Thesis, Leiden University.
Hjellming, R.M., and Newell, R.T. 1983, Ap.J. 275, 704.
Hollis, J.M., Kafatos, M., Michalitsianos, A.G., and McAlister, H.M. 1984, Ap.J. (in press).
Johnston, K.J., Wade, C.M., and Florkowski, D.R. 1983, in I.A.U. Colloquium 76, ed. A.G. Davis Philip and A.R. Upgren, p.69.
Johansson, L.E.B., Andersson, C., Goss, W.M., and Winnberg, A. 1977, Astr. Ap. Suppl. 28, 199.
Jura, M. 1982, private communication.
Jura, M., and Helfand, D.J. 1984, Ap.J. (in press).
Knapp, G.R. 1985, this meeting, 159, 171, 175, 177.
Knapp, G.R., and Bowers, P.F. 1983, Ap.J. 266, 701.
Knapp, G.R., and Morris, M. 1984, submitted to Ap.J.
Kohoutek, L. 1983, M.N.R.A.S. 204, 93p.
Kwok, S., and Feldman, P.A. 1981, Ap.J. (Letters) 247, L67.
Kwok, S., and Bigneil, R.C. 1984, Ap.J. 276, 544.
Marionni, P.A. 1977, Ph.D. Thesis, University of Maryland.
Moran, J.M., Garay, G., Reid, M.J., Genzel, R., Wright, M.C.H., and Plambeck, R.L. 1983, Ap.J. (Letters) 271, L31.
Morris, M., and Jura, M. 1983, Ap.J. 267, 179.
Morris, M., Jura, M., and Stark, A.A. 1984, in preparation.
Mufson, S.L., Lyon, J., and Marionni, P.A. 1975, Ap.J. (Letters) 201, L85.
Newell, R.T., and Hjellming, R.M. 1982, Ap.J. 263, L85.
Panagia, N., and Felli, M. 1975, Astr. Ap. 39, 1.
Pottasch, S.R., Goss, W.M., Arnal, E.M., and Gathier, R. 1982, Astr. Ap. 106, 229.
Rodríguez, L.F., and García-Barreto, J.A., 1984, Ap.J. (in press).
Rodríguez, L.F., and Moran, J.M. 1983, Nature 229, 323.
Seaquist, E.R., and Davis, L.E. 1983, Ap.J. 274, 659.
Sopka, R.J., Herbig, G., Kafatos, M., and Michalitsianos, A.G. 1982, Ap.J. (Letters) 258, L35.
Spergel, D.N., Giuliani, J.L., and Knapp, G.R. 1983, Ap.J. 275, 330.
Turner, B.E. 1979, Astr. Ap. Suppl. 37, 1.
Walsh, J.R. 1983, M.N.R.A.S. 202, 303.
Wright, A.E., and Barlow, M.J. 1975, M.N.R.A.S. 170, 41.
Zuckerman, B. 1978, in l.A.U. Symposium 76, ed. Y. Terzian (D. Reidel).
Zuckerman, B. 1979, Ap.J. 230, 442.
Zuckerman, B., Terzian, Y., and Silverglate, P. 1980, Ap.J. 241, 1014.
Zuckerman, B., Palmer, P., Morris, M., Turner, B.E., Gilra, D.P., Bowers, P.F., and Gilmore, W.S. 1977, Ap.J. (Letters), 211, L97.
Zuckerman, B., Palmer, P., Gilra, D.P., Turner, B.E., and Morris, M. 1978, Ap.J. (Letters) 220, L53.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1985 D. Reidel Publishing Company
About this paper
Cite this paper
Knapp, G.R. (1985). 21-CM Line and Radio Continuum Emission from Circumstellar Envelopes around Late-Type Giants. In: Morris, M., Zuckerman, B. (eds) Mass Loss from Red Giants. Astrophysics and Space Science Library, vol 117. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5428-1_29
Download citation
DOI: https://doi.org/10.1007/978-94-009-5428-1_29
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8896-1
Online ISBN: 978-94-009-5428-1
eBook Packages: Springer Book Archive