H2 and Br-gamma narrow-band imaging of bipolar planetary nebulae

Details H2 and Br-gamma narrow-band imaging of bipolar planetary nebulae H2 and Br-gamma narrow-band imaging of bipolar planetary nebulae

1999-10-20

arxiv.org/abs/astro-ph/9910377v1

Astrophys.J.Suppl. 127 (2000) 125-140

Astronomy and Astrophysics

Astrophysics

To be published in The Astrophysical Journal Suplement Series, 19 pages, 10 figures

Scientific paper

10.1086/313311

We present near-IR narrow-band continuum-subtracted images in the H$_2$ $2.122\mu$m, and Br$\gamma$ $2.166\mu$m emission lines for a sample of 15 bipolar planetary nebulae. H$_2$ emission was definitely detected for most of the objects in this sample (13 out of 15). The very high H$_2$ detection rate supports the idea that bipolar planetary nebulae have important reservoirs of molecular material and offer suitable physical conditions for the excitation of H$_2$. The strength of the H$_2$ emission and the H$_2$/Br$\gamma$ flux ratio are found to correlate with the morphology of the bipolar nebulae observed. Bipolar PNe with broad and bright rings exhibit stronger H$_2$ emission than bipolar PNe with narrow twists. High-quality (sub-arcsec) [N~{\sc ii}] and H$\alpha$ optical images have been used to compare the distribution of the ionized and molecular material. The H$_2$ emission lies just outside the optical [N~{\sc ii}] emission zone.

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