| Issue |
A&A
Volume 391, Number 2, August IV 2002
|
|
|---|---|---|
| Page(s) | 689 - 692 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20020848 | |
| Published online | 02 August 2002 | |
The early interaction of the planetary nebula NGC 40 with the interstellar medium
1
University of Virginia, Department of Astronomy, PO Box 3818, Charlottesville, VA 22903-0818, USA e-mail: jrm7w@virginia.edu; kx8u@virginia.edu
2
Department of Physics, University of Haifa at Oranim, Tivon 36006, Israel
Corresponding author: N. Soker, soker@physics.technion.ac.il
Received:
20
March
2002
Accepted:
6
June
2002
We report the detection of an Hα emission-line structure in the upstream side of the planetary nebula NGC 40, which is predicted by numerical simulations, and which is attributed to Rayleigh-Taylor instability. Such a Rayleigh-Taylor instability is expected to occur at early stages of the interaction process between the interstellar medium (ISM) and a fast moving planetary nebula, as is the case for NGC 40. We resolved the Rayleigh-Taylor instability “tongues”, as well as the flatness of the nebula around the “tongues”, which results from the deceleration by the ISM.
Key words: planetary nebulae: general / ISM: structure / planetary nebulae: individual: NGC 40 / instabilities
© ESO, 2002
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