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20 papers
Spitzer IRS Spectra and Envelope Models of Class I Protostars in Taurus
E. Furlan, M. McClure, N. Calvet +8
We present Spitzer Infrared Spectrograph spectra of 28 Class I protostars in the Taurus star-forming region. The 5 to 36 micron spectra reveal excess emission from the inner region…
Crystalline silicates and dust processing in the protoplanetary disks of the Taurus young cluster
Dan M. Watson, Jarron M. Leisenring, Elise Furlan +15
We characterize the crystalline silicate content and spatial distribution of small dust grains in a large sample of protoplanetary disks in the Taurus-Auriga young cluster, using S…
The 15 - 20 Micron Spitzer Spectra of Interstellar Emission Features in NGC 7023
K. Sellgren, K. I. Uchida, M. W. Werner
We present 15 - 20 micron long-slit spectra, from the Infrared Spectrograph (IRS) on Spitzer, of NGC 7023. We observe recently-discovered interstellar emission features, at 15.9, 1…
A Survey and Analysis of Spitzer Infrared Spectrograph Spectra of T Tauri Stars in Taurus
E. Furlan, L. Hartmann, N. Calvet +9
We present mid-infrared spectra of T Tauri stars in the Taurus star-forming region obtained with the Spitzer Infrared Spectrograph (IRS). For the first time, the 5-36 micron spectr…
Mid-Infrared Spectroscopy of Disks around Classical T Tauri Stars
W. J. Forrest, B. Sargent, E. Furlan +18
We present the first Spitzer Infrared Spectrograph (IRS; The IRS was a collaborative venture between Cornell University and Ball Aerospace Corporation funded by NASA through the Je…
The Double Helix Nebula: a magnetic torsional wave propagating out of the Galactic centre
Mark Morris, Keven Uchida, Tuan Do
Radioastronomical studies have indicated that the magnetic field in the central few hundred parsecs of our Milky Way Galaxy has a dipolar geometry and a strength substantially larg…