Optical and Near Infrared Study of the Cepheus E outflow, a very low   excitation object
  We present images and spectra of the Cepheus E (Cep E) region at both optical and infrared wavelengths. Only the brightest region of the southern lobe of the Cep E outflow reveals optical emission, suggesting that the extinction close to the outflow source plays an important r\^ole in the observed difference between the optical and IR morphologies. Cep E is a unique object since it provides a link between the spectroscopic properties of the optical Herbig-Haro (HH) objects and those of deeply embedded outflows. 
S. Ayala, A. Noriega-Crespo, P.M. Garnavich, S. Curiel, A.C. Raga,   K.H. Bohm and J. Raymond