Abstract
Previous infrared sky surveys (IRC and AFGL) have revealed many asymptotic-giant-branch (AGB) stars which are totally obscured by circumstellar dust. These stars are characterized by the low colour temperatures (200-600K) and molecular emissions (in CO or OH) from the circumstellar envelopes. Subsequent infrared and millimeter observations suggest that they have mass loss rates of 10-5 – 10-4 M⊙ yr -1 and have circumstellar envelopes which are optically thick as far as λ ~ 10 µm. Since the mass loss rates are suspected to increase as stars ascend the AGB, very late AGB stars with low colour temperatures can be discovered by the IRAS sky survey. These stars will soon evolve into planetary nebulae (PN), and therefore the IRAS results may provide valuable information on the evolutionary nhase between AGB and PN.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Kwok, S. 1980: Astrophys. J., 236, 592.
Kwok, S. 1985: Astron. J., 90, 49.
Schönberner, D. 1983: Astrophys. J., 272, 708.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1986 D. Reidel Publishing Company
About this paper
Cite this paper
Kwok, S., Hrivnak, B.J., Milone, E.F., Boreiko, R.T. (1986). Ground-Based and IRAS Observations of Proto-Planetary Nebulae. In: Israel, F.P. (eds) Light on Dark Matter. Astrophysics and Space Science Library, vol 124. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4672-9_28
Download citation
DOI: https://doi.org/10.1007/978-94-009-4672-9_28
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8577-9
Online ISBN: 978-94-009-4672-9
eBook Packages: Springer Book Archive