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Planetary and Proto-Planetary Nebulae in the IRAS Two-Colour Diagram

Published online by Cambridge University Press:  07 August 2017

P. García-Lario ,
A. Manchado  and
S.R. Pottasch
P. García-Lario
Affiliation:
LAEFF - Estación de Villafranca del Castillo. Apdo. 50727. E-28080 Madrid (Spain)
A. Manchado
Affiliation:
Instituto de Astrofísica de Canarias. E-38200, La Laguna, Tenerife (Spain)
S.R. Pottasch
Affiliation:
Kapteyn Laboratorium, Postbus 800. NL-9700, AV Groningen (The Netherlands)

Abstract

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We present a study of the distribution of post-AGB stars and planetary nebulae (PNe) in the IRAS two-colour diagram. From the analysis of the distribution of spectral types of post-AGB stars in this diagram we conclude that the position at which a star leaves the infrared sequence of colours observed in AGB stars depends only on the initial mass of the progenitor star. The evolution after the end of the AGB phase takes place, in a first approximation, at a constant value of [25] – [60].

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 331
Copyright
Copyright © Kluwer 1993