Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..317g&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 317-322
Astronomy and Astrophysics
Astronomy
13
Cosmic Dust, Infrared Astronomy, Infrared Stars, Interstellar Extinction, Oxygen, Stellar Composition, Stellar Envelopes, Stellar Spectra, Astronomical Spectroscopy, Emission Spectra, Infrared Astronomy Satellite, Spaceborne Astronomy
Scientific paper
New 4 to 8 micron infrared spectroscopic observations of two oxygen-rich stars are presented and combined with IRAS LRS data to span the 4 to 24 micron wavelength range. In the 4 to 8 micron wavelength range, we observe a 7.15 micron (1400/cm) emission feature. The new feature at 7.15 microns is not uniquely correlated with any of the sharply defined 10, 11, 13.1, and 19.7 micron emission features that are known to be present in this class of circumstellar shells, but it does not appear to be correlated with the spectrally broad dust emission in the 10 to 20 micron spectral region. The feature has not been reported previously in any other astronomical environment. A reinterpretation of prior 4 to 8 micron spectroscopy of alpha Ori and R Cas reveals the presence of the 7.15 micron emission in alpha Ori and possibly in R Cas. The spectrally narrow 19.7 micron emission, that is distinctly diffeent than the relatively broad silicate 18 micron emmision feature in oxygen-rich dust shells, is also observed to be present in the LRS spectrum of SAO 197549. The implication of these observations is that a universal astronomical silicate does not exist in oxygen-rich circumstellar shells. This variety is analogous to that observed in interplanetary dust particles and may indicate an intimate relation between the classes of condensates.
Bregman Jesse D.
Goebel John Henry
Witteborn Fred. C.
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