MgS grain component in circumstellar shells

Details MgS grain component in circumstellar shells MgS grain component in circumstellar shells

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290l..35g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 290, March 1, 1985, p. L35-L39.

Astronomy and Astrophysics

Astrophysics

115

Carbon Stars, Inorganic Sulfides, Interstellar Matter, Magnesium Compounds, Stellar Composition, Stellar Envelopes, Astronomical Photometry, Far Infrared Radiation, Stellar Spectrophotometry

Scientific paper

In this letter, far-infrared spectrophotometry (30-55 microns) and photometry (53-200 microns) are presented which define, for the first time, the long wavelength limit of the previously unidentified 30 micron emission feature found in certain extreme carbon star spectra. The spectral similarities are sufficiently similar to those of solid MgS that MgS is proposed to be the band carrier. This is interpreted as the first direct evidence that chemical surface reactions occur on dust grains in circumstellar environments. The presence of MgS indicates that either the oxygen abundance is relatively low and/or the sulfur abundance is high in extreme carbon stars.

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