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arXiv:astro-ph/0403126 (astro-ph)
[Submitted on 4 Mar 2004]

Title:Time-dependent ejection velocity model for the outflow of Hen 3--1475

Authors:P.F. Velazquez, A. Riera, A.C. Raga
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Abstract: We present 2D axisymmetric and 3D numerical simulations of the proto-planetary nebula Hen 3-1475, which is characterized by a remarkably highly collimated optical jet, formed by a string of shock-excited knots along the axis of the nebula. It has recently been suggested that the kinematical and morphological properties of the Hen 3-1475 jet could be the result of an ejection variability of the central source (Riera et al. 2003). The observations suggest a periodic variability of the ejection velocity superimposed on a smoothly increasing ejection velocity ramp. From our numerical simulations, we have obtained intensity maps (for different optical emission lines) and position-velocity diagrams, in order to make a direct comparison with the HST observations of this object. Our numerical study allows us to conclude that a model of a precessing jet with a time-dependent ejection velocity, which is propagating into an ISM previously perturbed by an AGB wind, can succesfully explain both the morphological and the kinematical characteristics of this proto-planetary nebula.
Comments: Astronomy and Astrophysics (accepted) (8 figures)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0403126
  (or arXiv:astro-ph/0403126v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0403126
Journal reference: Astron.Astrophys. 419 (2004) 991-998
Related DOI: https://doi.org/10.1051/0004-6361%3A20035757

Submission history

From: Angels Riera [view email]
[v1] Thu, 4 Mar 2004 16:07:45 UTC (225 KB)
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