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Carbon stars with alpha-C:H emissionMany carbon stars in the IRS low resolution spectra (LRS) catalog were found which display emission spectra that compare favorable with the absorption spectrum of alpha-C:H. These stars have largely been classified as 4X in the LRS which has led to their interpretation by others in terms of displaying a mixture of the UIRF's 8.6 micron band and SiC at 11.5 microns. It was also found that many of these stars have a spectral upturn at 20+ microns which resembles the MgS band seen in carbon stars and planetary nebulae. It was concluded that this group of carbon stars will evolve into planetary nebulae like NGC 7027 and IC 418. In the presence of hard ultraviolet radiation the UIRF's will light up and be displayed as narrow emission bands on top of the broad alpha-C:H emission bands.
Document ID
19910005709
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gerbault, Florence (NASA Ames Research Center Moffett Field, CA, United States)
Goebel, John H. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1989
Publication Information
Publication: Interstellar Dust: Contributed Papers
Subject Category
Astrophysics
Accession Number
91N15022
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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