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Influence of the Environment on PAH Emission in Star-Forming Regions
V. Lebouteiller, J. Bernard-Salas, D. G. Whelan +5
We investigate the emission properties of polycyclic aromatic hydrocarbons (PAHs) in various metallicity environments with the Infrared Spectrograph on board Spitzer. Local giant H…
Dust at sub-solar metallicity: the case of post-AGB stars in the Large Magellanic Cloud
M. Matsuura, G. C. Sloan, J. Bernard-Salas +2
Low- and intermediate-mass stars are one of the important dust sources in the interstellar medium (ISM) of galaxies. The compositions of dust ejected from these stars are likely to…
Spitzer Spectroscopy of Mass Loss and Dust Production by Evolved Stars in Globular Clusters
G. C. Sloan, N. Matsunaga, M. Matsuura +7
We have observed a sample of 35 long-period variables and four Cepheid variables in the vicinity of 23 Galactic globular clusters using the Infrared Spectrograph on the Spitzer Spa…
The extraordinary mid-infrared spectral properties of FeLoBAL Quasars
D. Farrah, T. Urrutia, M. Lacy +7
We present mid-infrared spectra of six FeLoBAL QSOs at 1<z<1.8, taken with the Spitzer space telescope. The spectra span a range of shapes, from hot dust dominated AGN with silicat…
Rusty old stars: a source of the missing interstellar iron?
Iain McDonald, Gregory C. Sloan, Albert A. Zijlstra +5
Iron, the Universe's most abundant refractory element, is highly depleted in both circumstellar and interstellar environments, meaning it exists in solid form. The nature of this s…
Planetary nebulae abundances and stellar evolution II
S. R. Pottasch, J. Bernard-Salas
Context: In recent years mid- and far infrared spectra of planetary nebulae have been analysed and lead to more accurate abundances. It may be expected that these better abundances…