Circumstellar dust shells around very young and massive stars

Details Circumstellar dust shells around very young and massive stars Circumstellar dust shells around very young and massive stars

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.128..163g&link_type=abstract

(Universitaets-Sternwarte Jena, Jena Workshop on the Role of Dust in Dense Regions of Interstellar Matter, Georgenthal, East Ger

Astronomy and Astrophysics

Astronomy

16

Cosmic Dust, Early Stars, Infrared Sources (Astronomy), Infrared Stars, Stellar Envelopes, Optical Properties, Radiative Transfer, Silicates, Supermassive Stars

Scientific paper

The properties of dust in circumstellar shells around very young massive compact IR sources (Becklin-Neugebauer objects) are investigated. No correlation was found between the optical depth in the center of the 10-micron band and the 3.1-micron ice band. An inverse correlation between the strength of the silicate feature and the color temperature for the 8-13 micron interval was detected. The sample of BN objects extends this kind of relation already known for Mira stars and OH/IR stars to higher optical depths. A radiative transfer model for BN objects is presented, and its main properties are discussed. Using this model, the interpretation of the observations led to the conclusion that the type of silicates present in the dust shells of very young stellar objects is different from the type around oxygen-rich giants and supergiants. These different silicates may be tentatively identified with pyroxenes and olivines, respectively. The influence of the adopted dust model in deriving source parameters of BN objects was studied. The object W3-IRS5 was discussed in some detail.

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