Search Publications
ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: Towards an understanding of dust processing
Waters, L. B. F. M.; van den Ancker, M. E.; Meeus, G. +3 more
We present Infrared Space Observatory (ISO) spectra of fourteen isolated Herbig Ae/Be (HAEBE) stars, to study the characteristics of their circumstellar dust. These spectra show large star-to-star differences, in the emission features of both carbon-rich and oxygen-rich dust grains. The IR spectra were combined with photometric data ranging from t…
The CH out-of-plane bending modes of PAH molecules in astrophysical environments
Hony, S.; Tielens, A. G. G. M.; Allamandola, L. J. +3 more
We present 10-15 mu m spectra of a sample of H ii regions, YSOs and evolved stars that show strong unidentified infrared emission features, obtained with the ISO/SWS spectrograph on-board ISO. These spectra reveal a plethora of emission features with bands at 11.0, 11.2, 12.0, 12.7, 13.5 and 14.2 mu m. These features are observed to vary considera…
Processing of silicate dust grains in Herbig Ae/Be systems
Waters, L. B. F. M.; Hony, S.; Dominik, C. +3 more
We have analysed the 10 mu m spectral region of a sample of Herbig Ae/Be (HAEBE) stars. The spectra are dominated by a broad emission feature caused by warm amorphous silicates, and by polycyclic aromatic hydrocarbons. In HD 163296 we find aliphatic carbonaceous dust, the first detection of this material in a HAEBE star. The silicate band shows a …
ISOCAM observations of the rho Ophiuchi cloud: Luminosity and mass functions of the pre-main sequence embedded cluster
Prusti, T.; Olofsson, G.; Boulanger, F. +19 more
We present the results of the first extensive mid-infrared (IR) imaging survey of the rho Ophiuchi embedded cluster, performed with the ISOCAM camera on board the ISO satellite. The main rho Ophiuchi molecular cloud L1688, as well as the two secondary clouds L1689N and L1689S, have been completely surveyed for point sources at 6.7 mu m and 14.3 mu…
Ice absorption features in the 5-8 µm region toward embedded protostars
Whittet, D. C. B.; Schutte, W. A.; Tielens, A. G. G. M. +2 more
We have obtained 5-8 µm spectra towards 10~embedded protostars using the Short Wavelength Spectrometer on board the Infrared Space Observatory (ISO-SWS) with the aim of studying the composition of interstellar ices. The spectra are dominated by absorption bands at 6.0 µm and 6.85 µm. The observed peak positions, widths and relati…
A long-wavelength view on galaxy evolution from deep surveys by the Infrared Space Observatory
Aussel, H.; Elbaz, D.; Franceschini, A. +2 more
We discuss the constraints set on galaxy evolution by a variety of data from deep extragalactic surveys performed in the mid-IR and far-IR with the Infrared Space Observatory and with millimetric telescopes at longer wavelengths. These observations indicate extremely high rates of evolution for IR galaxies, exceeding those measured for galaxies at…
The deuterium abundance in Jupiter and Saturn from ISO-SWS observations
Lellouch, E.; Encrenaz, T.; de Graauw, T. +3 more
Observations with the Short Wavelength Spectrometer (SWS) onboard the Infrared Space Observatory (ISO) are used to determine the D/H ratio in Jupiter's and Saturn's atmospheres. The D/H ratio is measured independently in hydrogen (i.e. from the HD/H2 ratio) and methane (from CH3D/CH4). Observations of the HD R(2) a…
Incidence and survival of remnant disks around main-sequence stars
Kessler, M. F.; Siebenmorgen, R.; Bouchet, P. +8 more
We present photometric ISO 60 and 170 µm measurements, complemented by some IRAS data at 60 µm, of a sample of 84 nearby main-sequence stars of spectral class A, F, G and K in order to determine the incidence of dust disks around such main-sequence stars. Fifty stars were detected at 60 µm. 36 of these emit a flux expected from t…
Infrared to millimetre photometry of ultra-luminous IR galaxies: New evidence favouring a 3-stage dust model
Lemke, D.; Schulz, B.; Klaas, U. +7 more
Infrared to millimetre spectral energy distributions (SEDs) have been obtained for 41 bright ultra-luminous infrared galaxies (ULIRGs). The observations were carried out with ISOPHOT between 10 and 200 mu m and supplemented for 16 sources with JCMT/SCUBA at 450 and 850 mu m and with SEST at 1.3 mm. In addition, seven sources were observed at 1.2 a…
The Aromatic Infrared Bands as seen by ISO-SWS: Probing the PAH model
Léger, A.; Moutou, C.; Giard, M. +6 more
We discuss the Aromatic Infrared Band (AIB) profiles observed by ISO-SWS towards a number of bright interstellar regions where dense molecular gas is illuminated by stellar radiation. Our sample spans a broad range of excitation conditions (exciting radiation fields with effective temperature, T_eff, ranging from 23 000 to 45 000 K). The SWS spect…