Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..804..161s&link_type=abstract
PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP Conference Pr
Astronomy and Astrophysics
Astronomy
2
Planetary Nebulae, X-Ray Sources (Astronomical), Planetary Nebulae, X-Ray
Scientific paper
Recent observations using the Chandra X-ray Observatory and XXM Newton revealed without doubt diffuse X-ray emission from the shock-heated wind gas in planetary nebula (PN) interiors. Typical properties of the emitting gas are temperatures of a few 106 K and electron densities of the order of 100 cm-3. According to current hydrodynamical models, the shocked gas becomes too hot (T ~ 107-108 K) and too tenuous (ne ~ 1 cm-3) to produce the observed X-ray emission. However, the hot gas is confined by the rather cool (T ~ 10 000K) nebular gas, and thermal heat conduction across the interface between the hot and cool gas becomes important. It changes the contact discontinuity into a more extended transition layer covering the temperature range where the observed X-ray emission is thought to arise. To date, only similarity solutions for the hydrodynamical problem of PN evolution with heat conduction have been derived (Zhekov & Perinotto 1996). We present first results from new numerical simulations of the PN evolution including thermal conduction by electrons. We confront the X-ray luminosities predicted by these models with those derived from XMM/Chandra observations.
Bucciantini Niccolo
Landi Enrico
Perinotto Mario
Schönberner Detlef
Schwope Axel
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