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Kinematic Structure and Chemical Composition of the Double Shell PN NGC 3242

Published online by Cambridge University Press:  19 July 2016

K. C. Sahu ,
S. R. Pottasch ,
B. G. Anandarao  and
J. N. Desai
K. C. Sahu
Affiliation:
Kapteyn Laboratorium, Groningen, the Netherlands
S. R. Pottasch
Affiliation:
Kapteyn Laboratorium, Groningen, the Netherlands
B. G. Anandarao
Affiliation:
Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
J. N. Desai
Affiliation:
Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India

Abstract

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Kinematic study of the multiple shell PN NGC 3242 was carried out by obtaining Hα and [O III] line profiles at 9 positions of the nebula using a high-resolution (R ≅ 50,000) Fabry-Pérot spectrometer. The positions cover both the bright inner shell and the faint outer shell. It is shown here that the two apparently continuous shells are kinematically separate: the faint outer shell was ejected ∼ 5000 years earlier and has less expansion velocity than the bright inner shell.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 200
Copyright
Copyright © Kluwer 1989