Poster abstract details
Excitation conditions of the jets of the pPN CRL 618 as seen by the STIS (HST)
Abstract
We present the results of the optical spectroscopic observations (both medium and low spectral resolution) of the lobes of the proto-Planetary Nebula CRL 618 obtained with the Space Telescope Imaging Spectrograph on board of the {\it Hubble Space Telescope}. We have obtained de-reddened emission line ratios of several features which are reproduced by planar shocks moving through a dense medium ($\sim$ 10$^4$ cm$^{-3}$) with shock
velocities from 30 to 40 km s$^{-1}$.
velocities from 30 to 40 km s$^{-1}$.