| Optical and Near Infrared Study of the Cepheus E Outflow, a Very Low Excitation Object (2004) | |||||||||
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| Optical and Near Infrared Study the Cepheus outflow very low excitation object Ayala Instituto Astronomia UNAM Mkxico Mkxico sayala astroscu unam Noriega Crespo SIRTF Science Center IPAC Caltech Pasadena USA Garnavich Harvard Smithsonian Center for Astrophysics Garden Cambridge Curie and Raga Instituto Astronomia UNAM Mkxico Mkxico Bohm Astronomy Department University Washington Seattle and Raymond Harvard Smithsonian Center for Astrophysics Garden Cambridge Received accepted ABSTRACT present images and spectra the Cepheus Cep region both optical and infrared wavelengths Only the brightest region the southern lobe the Cep outflowreveals opticalemission suggesting that the extinction close the outflow source plays important the observed difference between the opticaland morphologies Cep auniqueobject since providesalink between the spectroscopic properties the optical Herbig Haro objects and those deeply embedded outflows The observed infrared lines allow determine excitation temperature Ortho Para ratio and S line ratio These results are consistent with the values observed for objects with detected NIR emission lines with shock excitation the main mechanism for their formation and also with the values observed for embedded NIR flows Theopticalspectroscopiccharacteristics Cep appear similar the ones low excitation objects However the electron density determined from the SII line ratio for this object and the iOO SII ratios are higher than the values all the previously studied | |||||||||
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