Double-Peaked Silicate Emission in the FU Ori Star V1057 Cyg

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Session 62 -- Very Young Stars
Display presentation, Thursday, 9:20-4:00, Pauley Room

[62.23] Double-Peaked Silicate Emission in the FU Ori Star V1057 Cyg

T.Y. Brooke (JPL/Caltech), M.S. Hanner (JPL/Caltech), A.T. Tokunaga (IfA/U. Hawaii)

A spectrum from 8-13 $\mu$m of the FU Ori star V1057 Cyg was obtained on 23 Jun 1992 UT with the CGS3 instrument at the United Kingdom Infrared Telescope on Mauna Kea. A double peaked silicate emission feature is evident. Assuming optically thin emission, the emissivity of the silicate grains is estimated. The first peak is not well-defined, but occurs between 9.6-10.1 $\mu$m; the second occurs at $\sim11.2$ $\mu$m. The feature profile does not resemble that commonly seen in molecular clouds (the ``Trapezium'' profile). It does resemble the silicate feature seen in comet Halley and certain other comets. Similar features are seen around the young stellar object Elias 1 and around $\beta$ Pic (Knacke et al. 1992, BAAS, 24, 789). In these objects, the 11.2 $\mu$m feature has been attributed to crystalline olivine. Whatever mechanism has served to anneal some of the silicates in comets may occur during the early stages of a star's life.

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