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Synthetic Spectra for Carbon Stars from Dynamica Model Atmospheres

Aringer, Bernhard; Loidl, Rita; Hron, Josef +2 more

Spectroscopy and Spectral Energy Distribution of the Peculiar Supergiant IRAS 04296+3429

Szczerba, R.; Klochkova, V. G.; Panchuk, V. E.

ISO Observations of Symbiotic Stars

Clavel, J.; Metcalfe, L.; Schulz, B. +8 more

A number of symbiotic stars have been observed with ISO. In addition to a number of emission lines, SWS observations of the symbiotic novae RR Tel and V1016 Cyg reveal prominent, broad 10 & 18 µm silicate dust features. The 10 µm features are similar to the crystalline silicate profiles seen in classical novae. There is some evidence that the …

Chemical Abundances of Planetary Nebulae: A UV to Far-IR Case Study of NGC 6153

Liu, X. -W.

First Results from ISO Spectra of Supernova Remnants Heavily Interacting with the ISM

Lutz, D.; Sturm, E.; Oliva, E. +2 more

ISO spectra of the supernova remnant RCW103 are presented. This object is the prototype of a SNR shock heavily interacting with dense ISM (probably a molecular cloud). The spectra are dominated by prominent lines and show very little continuum at λ < 40 µm suggesting that the 12 and 25 µm IRAS emission from these types of remnant could be domin…

Infrared Properties of a Large Ring Around the LBV G79.29+0.46

Landecker, T. L.; Heske, A.; Wendker, H. J. +2 more

G79.29+0.46 seems to be an unique object. Discovered as a nearly perfect ring in the radio continuum all subsequent observations are consistent with the interpretation that it is a large ring nebula (4‧) around an heavily reddened LBV. Our ISOPHOT and LWS observations on board of ISO show that an infrared ring coincides with the radio ring. Line e…

ISO LWS Observations of H2O from R Cas: A Consistent Model For Its Circumstellar Envelope

Omont, A.; Barlow, M. J.; Cox, P. +6 more

We present an ISO LWS 43-197 µm grating spectrum of the oxygen-rich AGB star R Cas. The spectrum is rich of isolated and blended H2O lines. For their identification and in order to determine the physical parameters of the circumstellar envelope, we have constructed a model which treats radiative transfer, chemical exchange and photodissociation re…

The 3.4 Microns Absorption Feature in CRL 618

Tielens, A. G. G. M.; Geballe, T. R.; Chiar, J. +1 more

Evolution of Southern Star-Forming Regions

Thi, W. F.; Burgdorf, M.; van Dishoeck, E. F. +5 more

We present ISO observations of bright, high-mass southern starforming regions with the Short Wavelength Spectrometer (SWS) and Long Wavelength Spectrometer (LWS). The selected targets show a range of pre-main sequence evolutionary phases. Whereas some objects still show interstellar ice features, the most evolved objects are coincident with ultra-…

EUV Spectral Variability and Non-Equilibrium Ionisation in the 'Quiet' Sun

Harrison, R. A.; Lanzafame, A. C.; Brooks, D. H. +2 more

Recent spectroscopic observations by the Solar and Heliospheric Observatory (SOHO) have revealed the dynamic nature of even the 'quiet' Sun. Spectral variability data clearly show that dynamics in the solar upper atmosphere take place on timescales shorter than those of ionisation relaxation. Accuracy in the interpretation of diagnostic spectral d…