[Fe II] Bubbles in the Young Planetary Nebula Hubble 12

Details [Fe II] Bubbles in the Young Planetary Nebula Hubble 12 [Fe II] Bubbles in the Young Planetary Nebula Hubble 12

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522l..69w&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 1, pp. L69-L72.

Astronomy and Astrophysics

Astronomy

23

Ism: Jets And Outflows, Ism: Planetary Nebulae: Individual: Alphanumeric: Hb 12, Stars: Evolution

Scientific paper

We have obtained narrowband images of the young planetary nebula Hubble 12 showing [Fe II] line emission in bipolar bubbles near the core. Bright [Fe II] emission is strong evidence for shocks, suggesting the presence of a high-velocity wind emanating from the central star. We compare our data to previously published images of Hubble 12-finding similar structures in hydrogen recombination and free-free emission-and we propose three possible interpretations of the data: that the bubbles indicate the inner shock of the fast wind, that the [Fe II] emission is evidence of the outer shock of an episodic wind, or that the emission is cooling line radiation from a photodissociation region. We argue that the first two interpretations are more likely, since the [Fe II] emission must be shock excited.

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