Red giants with unusual dust shells. I - The database

Details Red giants with unusual dust shells. I - The database Red giants with unusual dust shells. I - The database

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243...78s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 1, 1990, p. 78-86.

Astronomy and Astrophysics

Astronomy

40

Cosmic Dust, Infrared Spectra, M Stars, Red Giant Stars, Stellar Envelopes, Abundance, Infrared Astronomy Satellite, Oxygen, Silicon Carbides, Stellar Winds

Scientific paper

A number of red giants are classified as type M (oxygen-rich) but are defined in the IRAS LRS Catalog as having SiC emission (a characteristic of carbon-rich environments). It is shown that the NIR spectra are characteristic of oxygen-rich stars, but that at least some appear to have C/O abundance ratios close to unity (in other words they should be classified as S stars). It is suggested that, when C/O approaches unity, dust condensation theories assuming chemical and thermodynamic equilibrium may not be realistic. It is postulated that a number of carbon stars which have been found to have silicate dust features may also have C/O abundance ratios close to unity.

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