The unsual silicate dust around HV 2310, an evolved star in the LMC

G.C. Sloan, D. Devost, J. Bernard-Salas (Cornell), P.R. Wood (Australian National University), J.R. Houck (Cornell)

2006, ApJ, 638, 472

Full manuscript available from astro-ph (0509461) or locally: PDF or PS.

The spectrum of HV 2310, an evolved star in the Large Magellanic Cloud, taken with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope reveals the presence of an optically thin shell of silicate dust with unusual spectral structure in the 10 µm feature, with an emission peak at 9.7 µm, a saddle at 10.4 µm, and an extended shoulder to 11.2 µm. This structure is similar to spectra from crystalline silicate grains, and of the available optical constants, forsterite provides the best fit. The spectrum also shows structure at 14 µm which may arise from an unidentified dust feature.

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Last modified 26 January, 2006. © Gregory C. Sloan and others.