Abstract
The importance of the ‘‘continuum’’ emission has already been pointed out in several sources of high excitation (such as planetary nebulae) with the quantitative study of the emission bands at 7.7 and 11.3 μm with the IRAS/LRS spectra (Zavagno et al.). We present here a model of the observed continuum emission between 2 μm and 1 mm in the source NGC7027. We find evidences for the existence of a large emission band in the range 5–15 μm. This band is characteristic of amorphous carbon grains. Using the data given by Rouleau and Martin, we have been able to derive the extinction coefficient for three samples of such grains. With our model, we are able to reproduce the observed emission bump using amorphous carbon grains. It is then possible, for the first time, to know the exact contribution of the emission bands with respect to the continuum and, using the derived optical depth, to estimate the mass of carbon contained in amorphous carbon grains.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
