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21 papers · 2 filters
Annealing of Silicate Dust by Nebular Shocks at 10 AU
David E. Harker, Steven J. Desch
Silicate dust grains in the interstellar medium are known to be mostly amorphous, yet crystalline silicate grains have been observed in many long-period comets and in protoplanetar…
First Results from SPARO: Evidence for Large-Scale Toroidal Magnetic Fields in the Galactic Center
G. Novak, D. T. Chuss, T. Renbarger +6
We have observed the linear polarization of 450 micron continuum emission from the Galactic center, using a new polarimetric detector system that is operated on a 2 m telescope at…
The Formation and Evolution of Planetary Systems: SIRTF Legacy Science in the VLT Era
M. R. Meyer, D. Backman, S. V. W. Beckwith +20
We will utilize the sensitivity of SIRTF through the Legacy Science Program to carry out spectrophotometric observations of solar-type stars aimed at (1) defining the timescales ov…
USA Observation of Spectral and Timing Evolution During the 2000 Outburst of XTE J1550-564
K. T. Reilly, E. D. Bloom, W. Focke +14
We report on timing and spectral observations of the 2000 outburst of XTE J1550-564 made by the Unconventional Stellar Aspect (USA) Experiment on board the Advanced Research and Gl…
Discovery of water vapor around IRC+10216 as evidence for comets orbiting another star
Gary J. Melnick, David A. Neufeld, K. E. Saavik Ford +2
Since 1995, astronomers have discovered planets with masses comparable to that of Jupiter (318 times Earth's mass) in orbit around approximately 60 stars. Although unseen directly,…
Global Physical Conditions of the Interstellar Medium in Nearby Galaxies
T. Negishi, T. Onaka, K. -W. Chan +1
Far-infrared spectra (43-197um) of 34 nearby galaxies obtained by the Long Wavelength Spectrometer (LWS) aboard the Infrared Space Observatory (ISO) were analyzed to investigate th…