Spitzer mid-IR spectroscopy of Wolf-Rayet stars: the frequent detection of circumstellar dust

A. Barniske, L. Oskinova, W.-R. Hamann, G. Gräfener

Universität Potsdam, Institut für Physik, Astrophysik

We report recent observations with the Spitzer Space Telescope of the Wolf-Rayet stars WR 102ka and WR 102c, located in the vicinity of the Galactic Center. We used the short-high module of the IRS to obtain high quality mid-IR spectra. In this range from 10 -- 20$\mu$m, the spectra of both stars are dominated by dust emission, partly of circumstellar origin. Dust has not been detected before around WN types stars.

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