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ISO-SWS Observations of NGC 1068

Lutz, D.; Genzel, R.; Sturm, E. +2 more

We present a first analysis of 2.4-45µm spectra of NGC 1068 obtained with the Short Wavelength Spectrometer SWS on board the Infrared Space Observatory ISO. The measured fine-structure line fluxes can be fit successfully by a simple photoionization model invoking an EUV bump in the ionizing continuum, similar to the case of the Circinus galaxy. Di…

Circumstellar PAHs and Carbon Stardust

Tielens, A. G. G. M.

The SWS on ISO has revealed the incredible richness of IR emission features in the spectra of post-AGB objects and planetary nebulae. Besides the well known features at 3.3, 6.2, 7.7, 8.6, and 11.3 µm, a wealth of weaker features is present as well. These studies also reveal detailed variations from source to source, which may be of key impo…

ISO LWS Observations of Evolved Stars and Nebulae

Barlow, M. J.

Synthetic Spectra of Long-Period Variables: A First Comparison with ISO Observations

Aringer, Bernhard; Loidl, Rita; Hron, Josef +3 more

Exploratory synthetic spectra were computed for carbon-rich long-period variables. We used dynamic model atmospheres of Höfner & Dorfi (1997) and calculated partial pressures, absorption- and scattering coefficients as input for the spectral synthesis code of Jørgensen et al. (1992). First ISO SWS-observations of the carbon-Mira T Dra are comp…

ISO-SWS Spectra of AGB Stars

Waters, L. B. F. M.; Justtanont, K.; Yamamura, I. +1 more

In this contribution, we present a few highlights of the guaranteed time program to observe AGB stars with differing chemical compositions and mass loss rates using ISO¹ SWS. We briefly discuss C₂H₂ absorption in C-stars and O-rich stars with the 13 µm dust emission.

A Compact Circumstellar Dust Envelope of an Evolved AGB Star IRC-10529

Izumiura, H.; Hashimoto, O.

We have made far-infrared mapping observations around a heavily mass losing evolved star IRC-10529 with ISO. It is found that IRC-10529 shows a very compact circumstellar dust envelope in the 60 and 90 µm images obtained by ISOPHOT. Such a small size of the circumstellar dust envelope indicates very short history of the present strong mass loss. I…

Dust Features of Visually Bright AGB Variables as Seen by ISO and IRAS

Loidl, Rita; Hron, Josef; Kerschbaum, Franz

ISO-SWS spectra of two Mira variables (R Cas and T Dra), taken at two different pulsational phases, are presented. We describe the reduction of the data and the encountered problems. The dust features observed by ISO at different phases and with the Low Resolution Spectrometer of IRAS are compared. We briefly discuss the results in terms of curren…