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Circumstellar Silicate Mineralogy

Waters, L. B. F. M.; Justtanont, K.; Tielens, A. G. G. M. +1 more

This paper reviews spectra obtained with the SWS on board of ISO of dust shells around O-rich objects. These spectra reveal the presence of many new emission features between 10 and 45 µm. These bands are generally much narrower than the well-known 10 and 20 µm silicates features. The strength of these features relative to the underlying broad con…

ISO LWS Observations of Cool Evolved Stars and Post-AGB Objects

Barlow, M. J.

ISO-SWS Spectra of OH/IR Stars

Waters, L. B. F. M.; Yamamura, I.; de Jong, T. +2 more

We present the spectra of 5 OH/IR stars observed with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO). The spectra are dominated by dust features, both in the amorphous and crystalline state and illustrate the influence of the mass loss rate on the observed spectral features.

Molecules of Non-Photospheric Origin in Red Giants and Supergiants Revealed by the ISO SWS

Ohnaka, K.; Yamamura, I.; Tsuji, T. +1 more

Overall SEDs based on ISO SWS observations show fair agreement with photospheric model predictions for red (super)giant stars. However, some details of molecular spectra cannot be explained by a photospheric origin. In particular, fine structure in the H2O 2.7 µm band can be clearly resolved by the SWS and is identified in an early M giant, whose …

ISO Observations of Isolated Herbig AE/BE Stars

Waters, L. B. F. M.; Waelkens, C.; Malfait, K.

We report on SWS and LWS observations of the circumstellar disks of young stars of a few solar masses. The ISO spectra of these objects present a diversity of emission features of carbon-rich and oxygen-rich grains. The similarity of the forsterite spectra observed for Comet Hale-Bopp and the Haebe star HD100546 is particularly striking and provid…

Tentative Detection of Circumstellar CO2 from the AGB Star R Crateris

Ryde, N.; Eriksson, K.; Gustafsson, B. +2 more

We report on and discuss the detection of an emission feature at 14.98 µm from the oxygen-rich, semi-regularly pulsating Asymptotic Giant Branch star R Crateris, a feature which we suggest to be due to the <Stack> ₀ ¹ </Stack> Q-branch of circumstellar CO2. We also suggest a reasonable excitation mechanism, which …

Extreme Infrared Stars Discovered in Magellanic Cloud Globular Clusters

Glass, I. S.; Sauvage, M.; Onaka, T. +3 more

We report preliminary results of our systematic survey for infrared stars in the globular clusters of the Magellanic Clouds. In the course of an ISOCAM survey for AGB stars in the intermediate-age clusters, we have discovered extremely red AGB stars in NGC 419 and NGC 1978. From their colours and luminosities, they are thought to be experiencing i…

Dust in LBV Nebulae

Waters, L. B. F. M.; Morris, P. W.; Lamers, H. J. G. L. M. +2 more

Infrared Observations of the Transition from Chaotic to Crystalline Silicates via Thermal Annealing in the Laboratory

Hallenbeck, S.; Nuth, J.

ISO-SWS Observations of Weak Bands of Trace Components of Ices Towards the Young Stellar Object W 33A

van Dishoeck, E. F.; Whittet, D. C. B.; Schutte, W. A. +3 more

ISO-SWS observations of the highly obscured young stellar object W 33A reveal two broad absorption features centered at 7.24 and 7.40 µm. The position and width of these features indicates that they are due to the XH bending mode (X = C, N, or O) of molecules in the solid state. Comparison to interstellar ice analogs shows that the 7.24 µm band ca…