Anthony F. J. Moffat

The William-Wehlau Spectropolarimeter: Observing Hot Stars in All Four Stokes Parameters

We introduce a new polarimeter unit, which, mounted at the Cassegrain focus of any telescope and fiber-connected to a fixed CCD spectrograph, is able to measure all Stokes parameters I, Q, U, and V across spectral Lines of bright stellar targets and other

Search for polycyclic aromatic hydrocarbons in the outflows from dust-producing Wolf–Rayet stars

A combined mid-IR spectrum of five colliding-wind, massive, dust-producing Population I Wolf-Rayet (WR) binaries shows a wealth of absorption and emission details coming from the circumstellar dust envelopes, as well as from the interstellar medium. The prominent absorption features may arise from a mix of interstellar carbonaceous grains formed in high- (e.g., 3.4, 6.8, 7.2

Inhomogeneous winds: the nature of emission-line profile variations in Wolf-Rayet spectra

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Dust-formation episode of the long-period WC+O binary WR 137: direct imaging with HST-NICMOS2

m) and low-temperature (3.3, 6.9, 9.3

No stellar p-mode oscillations in space-based photometry of Procyon

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Massive Stars in Interactive Binaries

m) environments. The broad emission complexes around

Blobs also in O star winds

sim

Trumpler 16 in the CCCP (Wolk+, 2011)

6.5, 8.0 and 8.8

General Discussion Sessions 1 and 2

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General Discussion Session 4d

m could arise from ionized, small polycyclic aromatic hydrocarbon (PAH) clusters and/or amorphous carbonaceous grains. As such these PAH emissions may represent the long sought after precursors of amorphous Carbon dust. We also detect a strong