Knots in the outer shells of the planetary nebulae IC 2553 and NGC 5882

Details Knots in the outer shells of the planetary nebulae IC 2553 and NGC 5882 Knots in the outer shells of the planetary nebulae IC 2553 and NGC 5882

2000-03-16

arxiv.org/abs/astro-ph/0003238v1

ApJ 542 (2000) 861-869

Astronomy and Astrophysics

Astrophysics

20 pages including 1 table and 6 figures. ApJ accepted. Also available at http://andromeda.roque.ing.iac.es/~sanchez/ingpub/in

Scientific paper

10.1086/317041

We present images and high-resolution spectra of the planetary nebulae IC 2553 and NGC 5882. Spatio-kinematic modeling of the nebulae shows that they are composed of a markedly elongated inner shell, and of a less aspherical outer shell expanding at a considerably higher velocity than the inner one. Embedded in the outer shells of both nebulae are found several low-ionization knots. In IC 2553, the knots show a point-symmetric distribution with respect to the central star: one possible explanation for their formation is that they are the survivors of pre-existing point-symmetric condensations in the AGB wind, a fact which would imply a quite peculiar mass-loss geometry from the giant progenitor. In the case of NGC 5882, the lack of symmetry in the distribution of the observed low-ionization structures makes it possible that they are the result of in situ instabilities.

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