Mid-IR (8-13 micrometer) images of the 21 micrometer, carbon rich proto-planetary nebulae

Details Mid-IR (8-13 micrometer) images of the 21 micrometer, carbon rich proto-planetary nebulae Mid-IR (8-13 micrometer) images of the 21 micrometer, carbon rich proto-planetary nebulae

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....3...53m&link_type=abstract

Experimental Astronomy, vol. 3, no. 1-4, p. 53-56

Astronomy and Astrophysics

Astronomy

4

Asymptotic Giant Branch Stars, Carbon, Infrared Astronomy, Infrared Imagery, Planetary Nebulae, Stellar Composition, Stellar Envelopes, Stellar Evolution, Astronomical Photography, Bipolarity, Cyclic Hydrocarbons, Infrared Photography, Infrared Telescopes

Scientific paper

We present 9.7 and 11.8 micrometer narrow band delta-lambda/lambda = 10%) images of three carbon (C-) rich proto-planetary nebulae with an unusual 21 micrometer feature: Infrared Astronomy Satellite (IRAS) 07134+1005, IRAS 22272+5435, and IRAS 04296+3429. The images were taken at the United Kingdom Infrared Telescope (UKIRT) using the Berkeley/IGPP/LEA mid-IR camera. All three objects have a bipolar shape adding to the existing evidence that C-rich proto-planetary nebulae (PPNe) are by nature bipolar. Futhermore, we find the same bipolar morphology in a previous study of the C-rich, young planetary nebula, IRAS 21282+5050. We believe these four objects form an evolutionary sequence which links the C-rich asymptotic giant branch (AGB) stars with the C-rich planetary nebulae (PNe). From this evolutionary sequence, we conclude that bipolarity in C-rich planetary nebulae (PNe) begins on the AGB and that the dynamical ages of these PPNe are in fair agreement with theoretical ages for a 0.6 solar mass hydrogen burning core star.

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