Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..481r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 1, 1984, p. 481-492.
Astronomy and Astrophysics
Astronomy
161
Astronomical Photometry, Cosmic Dust, Interstellar Extinction, Wolf-Rayet Stars, Infrared Absorption, Optical Thickness, Silicates, Supergiant Stars, Variable Stars
Scientific paper
In the present investigation of the 10-micron extinction towards six WC8 or WC9 Wolf-Rayet stars, all objects are noted to show smooth dust emission having Si absorption whose depths are well correlated with extinction in the visible. The extinction to the stars is found to be predominantly interstellar in origin, with little being due to the circumstellar shell. The shape of the silicate absorption is better represented by a curve that is derived from the circumstellar dust shell of the M supergiant Mu Cep, than by that from the Trapezium in Orion. The A(v)/tau(9.7) ratio of 18.5 that is presently obtained holds over at least two directions in the galactic plane, as well as within the local 3 kpc.
Aitken David K.
Roche Patrick F.
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