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The Infrared Space Observatory (ISO) mission.
Kessler, M. F.; Clavel, J.; Taylor, B. G. +8 more
ESA's Infrared Space Observatory (ISO) is an astronomical satellite, operating at wavelengths from 2.5-240 µm. Essentially, ISO consists of a large cryostat which contained at launch about 2300 litres of superfluid helium to maintain the Ritchey-Chretien telescope, the scientific instruments and the optical baffles at temperatures of 2-8 K. …
Observing with the ISO Short-Wavelength Spectrometer.
Lutz, D.; Genzel, R.; Heras, A. M. +59 more
The Short-Wavelength Spectrometer (SWS) is one of the four instruments on-board ESA's Infrared Space Observatory (ISO), launched on November 17, 1995. The spectrometer covers the wavelength range of 2.38 to 45.2µm with a spectral resolution ranging from 1000 to 2000. By inserting Fabry-Perot filters the resolution can be enhanced by a factor…
O-star mass-loss and wind momentum rates in the Galaxy and the Magellanic Clouds Observations and theoretical predictions.
Lennon, D. J.; Herrero, A.; Pauldrach, A. W. A. +8 more
A new, very fast approximate method is presented to determine mass-loss rates of O-stars from Halpha_ line profiles. The method uses H and HeII departure coefficients from unified model atmospheres parametrized in a simple way as function of wind velocity together with photospheric NLTE line profiles as the inner boundary condition for …
ISOPHOT - capabilities and performance.
Telesco, C.; Lemke, D.; Schulz, B. +46 more
ISOPHOT covers the largest wavelength range on ISO from 2.5 to 240µm. Its scientific capabilities include multi-filter and multi-aperture photometry, polarimetry, imaging and spectrophotometry. All modes can optionally include a focal plane chopper. The backbone of the photometric calibration are internal standard sources checked against cel…
ISOCAM in flight.
Altieri, B.; Aussel, H.; Elbaz, D. +63 more
ISOCAM, the camera on-board ISO, takes images of the sky in the wavelength range 2.5 to 18µm. It features two independent channels, containing each a 32x32 pixel detector: the short wavelength channel, 2.5 to 5.5µm, and the long wavelength channel, 4 to 18µm. Each channel features 10 or 11 discrete band pass filters and CVFs with…
The ISO Long-Wavelength Spectrometer.
Omont, A.; Ade, P. A. R.; Liseau, R. +60 more
The Long-Wavelength Spectrometer (LWS) is one of two complementary spectrometers aboard the European Space Agency's Infrared Space Observatory (ISO) (Kessler et al., 1996A&A...315L..49D). It operates over the wavelength range 43-196.9µm at either medium (about 150 to 200) or high (6800 to 9700) spectral resolving power. This Letter descr…
Mineralogy of oxygen-rich dust shells.
Lutz, D.; Genzel, R.; Heras, A. M. +34 more
Spectra taken with the Short Wavelength Spectrometer on board of the Infrared Space Observatory of dust shells around evolved oxygen-rich stars reveal the presence of several emission features at wavelengths between 20 and 45µm. These features have a range of widths and strengths, but are all narrow compared to the well-known amorphous silic…
SWS observations of the Galactic center.
Lutz, D.; Genzel, R.; Sturm, E. +11 more
We present a 2.4-45µm spectrum of the center of our Galaxy obtained with the Short Wavelength Spectrometer (SWS) on board ISO. The wide range of ionic fine structure lines observed yields an average effective temperature for the ionizing stars of 35000K, with a small contribution of significantly hotter stars, consistent with ageing of an ac…
First ISOCAM images of the Milky Way.
Elbaz, D.; Prusti, T.; Cesarsky, C. +21 more
ISOGAL is a 15µm ISOCAM survey of ~12deg^2^ in the Galactic Plane interior to |l|=45°. In combination with IJK data from the near-infrared southern sky survey DENIS, the ISO images allow the first detailed study of stellar populations throughout the inner Galaxy. We present preliminary results from a test observation at l= -45° with 6" pixel…
SWS observations of young main-sequence stars with dusty circumstellar disks.
Heras, A. M.; Waters, L. B. F. M.; Beintema, D. A. +18 more
We present SWS full-scan observations of three objects that are thought to be in a stage of evolution between the youngest, embedded, Herbig Ae/Be stars and Beta Pictoris, a young main-sequence star with a circumstellar disk. The 8-12µm spectra of all three stars cannot be understood in terms of purely amorphous silicates, but require the pr…