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12 papers · 2 filters
Mid-Infrared Emission from Elliptical Galaxies: Sensitivity to Stellar Age
Pasquale Temi, Fabrizio Brighenti, William G. Mathews
Mid-infrared observations (3.6 - 24 microns) of normal giant elliptical galaxies with the Spitzer space telescope are consistent with pure populations of very old stars with no evi…
Amorphous alumina in the extended atmosphere of Alpha Orionis
T. Verhoelst, L. Decin, R. Van Malderen +7
In this paper we study the extended atmosphere of the late-type supergiant Alpha Orionis. Infrared spectroscopy of red supergiants reveals strong molecular bands, some of which do…
Pixie Dust: The Silicate Features in the Diffuse Interstellar Medium
J. E. Chiar, A. G. G. M. Tielens
We have analyzed the 9.7 and ``18'' micron interstellar silicate absorption features along the line of sight toward four heavily extincted galactic WC-type Wolf-Rayet (WR) stars. W…
VSOP monitoring of the compact BL Lac object AO 0235+164
S. Frey, L. I. Gurvits, D. C. Gabuzda +7
In 1999, the highly compact and variable BL Lac object AO 0235+164 was identified as the highest brightness temperature active galactic nucleus observed with the VLBI Space Observa…
Atmosphere, Interior, and Evolution of the Metal-Rich Transiting Planet HD 149026b
J. J. Fortney, D. Saumon, M. S. Marley +2
We investigate the atmosphere and interior of the new transiting planet HD 149026b, which appears to be very rich in heavy elements. We first compute model atmospheres at metallici…
Formation and Evolution of Planetary Systems: Placing Our Solar System in Context with Spitzer
Michael R. Meyer, the FEPS Legacy Science Team
We summarize the progress to date of our Legacy Science Program entitled "The Formation and Evolution of Planetary Systems" (FEPS) based on observations obtained with the Spitzer S…