Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..301r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 2, p. 301-305.
Astronomy and Astrophysics
Astronomy
23
Cosmic Dust, Infrared Astronomy, Magellanic Clouds, Stellar Envelopes, Stellar Evolution, Supergiant Stars, Infrared Spectra, Stellar Mass Ejection
Scientific paper
Spectra at 8-13 microns are presented of five LMC supergiant stars with circumstellar dust emission. The brightest two objects were discovered in the IRAS survey and have thick dust shells with deep silicate absorption features; they are probably late-type M supergiants undergoing very heavy mass loss. Comparison between the current data and previous mid-IR photometry suggests that the apparent depth of the silicate feature in the OH/IR star IRAS 04553-6825 has varied over a 5-yr interval. The peculiar B(e) hypergiant R 126 displays a strong circumstellar dust shell, but with a very muted silicate emission feature. The G supergiant R 150 and the luminous blue variable star R 71 display prominent silicate emission bands, but in both objects there is evidence that the dust distribution increases away from the star, suggesting that the bulk of the dust was produced at a previous evolutionary stage wherein the mass-loss rates were much higher. The silicate features indicate that the material lost from the stars is oxygen-rich, in agreement with stellar evolution models.
Aitken David K.
Roche Patrick F.
Smith Craig H.
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