The importance of soft X-rays for the excitation of H2 emission in planetary nebulae

Details The importance of soft X-rays for the excitation of H2 emission in planetary nebulae The importance of soft X-rays for the excitation of H2 emission in planetary nebulae

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.368..819p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 368, Issue 2, pp. 819-824.

Astronomy and Astrophysics

Astronomy

4

Planetary Nebulae: General, Infrared: Ism

Scientific paper

We note that H2 emitting planetary nebulae tend to have Zanstra temperatures TZ(HeII) > 90 kK. This is shown to be consistent with a large evolutionary lifetime, and the kinematic ages of the envelopes. Non-local thermodynamic equilibrium stellar atmospheric modelling also shows that levels of soft X-ray emission increase more rapidly than has previously been assumed, and are preferentially large in H2 emitting sources. It is suggested that this may hold the key to explaining the strengths of the H2 transitions.

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