We present a complete study of the H2 infrared emission, including the pure rotational lines, of the proto Planetary Nebulae CRL 618 with the ISO SWS. A large number of lines are detected. The analysis of our observations shows: (i) an OTP ratio very different from the classical value of 3, probably around 1.76-1.87; (ii) a stratification of the emitting region, and more precisely different regions of emission, plausibly located in the lobes, in an intermediate zone, and close to the torus; (iii) different excitation mechanisms, collisions and fluorescence.
@article{arxiv.astro-ph/0001017,
title = {H2 emission from CRL 618},
author = {F. Herpin and J. Cernicharo and A. Heras},
journal= {arXiv preprint arXiv:astro-ph/0001017},
year = {2007}
}
Comments
4 pages, 3 figures, proceeding of the "H2 in Space" conference, Paris, September 1999