Do S stars show strong silicate dust emission?

Details Do S stars show strong silicate dust emission? Do S stars show strong silicate dust emission?

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.304..421l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 304, Issue 2, pp. 421-424.

Astronomy and Astrophysics

Astronomy

8

Stars: Carbon, Circumstellar Matter, Stars: Late-Type, Infrared: Stars

Scientific paper

S stars are generally regarded as intermediate between M and carbon stars in their properties, including the composition of their circumstellar material, as befits stars having an intermediate level of C/O enhancement. The existence of several stars with optical S classification but very strong silicate dust emission at 10 mu m presents an anomaly. One suggestion was that these stars are intermediate between M stars and the ^13C-rich carbon stars with silicate dust emission from circumstellar material. However, new optical spectra show that these stars are either M stars or marginal MS stars, so that silicate dust emission declines along the M -> MS -> S sequence and is not present in C stars, with the exception of a few J-type silicate-carbon stars.

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