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Infrared spectra of carbon stars observed by the ISO SWS bands at 14 µ m. II. HCN and C2H2
Ohnaka, K.; Tsuji, T.; Aoki, W.
We analyzed the mid-infrared spectra of 4 optical carbon stars and 4 candidates of infrared carbon stars obtained with the ISO SWS. It has been revealed that special care should be taken in determining the continuum levels for the analysis of the emission and absorption bands of HCN and C2H2 at 14 mu m; otherwise the SiC emis…
Upper limit on C60 and C60(+) features in the ISO-SWS spectrum of the reflection nebula NGC 7023
Léger, A.; Moutou, C.; Verstraete, L. +1 more
We present here the 7.0-8.7 mu m spectrum of the bright reflection nebula NGC 7023. Our observations are made with the Short Wavelength Spectrometer (SWS) on the European satellite Infrared Space Observatory (ISO). The vibrational bands of the ionized fullerene C60(+) are expected at 7.11 and 7.51 mu m, while those of the neutral fuller…
Temperature and density in a polar plume - measurements from CDS/SOHO
Young, P. R.; Mason, H. E.; Klimchuk, J. A.
A detailed analysis of a particularly intense polar plume observed on the 25th of October, 1996, by the Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO) is presented. Above the limb, emission measure distributions derived for both the plume and a section of coronal hole background are found to be sharply…
ISOCAM spectro-imaging of the H_2 rotational lines hfill in the supernova remnant IC 443
Boulanger, F.; van Dishoeck, E. F.; Wright, C. M. +3 more
We report spectro-imaging observations of the bright western ridge of the supernova remnant
Infrared spectral observations of comet 103P/Hartley 2 by ISOPHOT
Fulle, M.; Brucato, J. R.; Mennella, V. +7 more
Spectral observations in the 2.5-12 mu m range of comet 103P/Hartley 2 were performed on 1 Jan. 1998 by the ISOPHOT instrument, on board the Infrared Space Observatory. The obtained spectrum evidences intense bands at 2.66 and 4.26 mu m, attributable to H_2O and CO_2, respectively. The derived molecular production rates are Q(H_2O) = (3.1 +/- 0.2)…
Deep Galaxy survey at 6.75mu M with the ISO satellite
Elbaz, D.; Omont, A.; Eales, S. +8 more
Deep 6.75mu m mid-IR ISOCAM observations were obtained from the Canada-France Redshift Survey (CFRS) 1415+52 field with the Infrared Space Observatory. The identification of the sources with optical counterparts is described in detail, and a classification scheme is devised which depends on the S/N of the detection and the inverse probability of c…
Analysis of ultraviolet and extreme-ultraviolet spectra of the DA white dwarf G 191-B2B using self-consistent diffusion models
Dreizler, S.; Wolff, B.
We present a multi-wavelength spectral analysis of the DA white dwarf G 191-B2B. The employed atmospheric models account for gravitational settling and radiative levitation, which are, for the first time, calculated self-consistently with the atmospheric structure. The resulting spectra can reproduce the complete EUVE spectrum and the ultraviolet …
Wolf-Rayet nebulae as tracers of stellar ionizing fluxes. I. M1-67
Schmutz, W.; Hillier, D. J.; de Koter, A. +3 more
We use WR124 (WN8h) and its associated nebula M1-67, to test theoretical non-LTE models for Wolf-Rayet (WR) stars. Lyman continuum ionizing flux distributions derived from a stellar analysis of WR124, are compared with nebular properties via photo-ionization modelling. Our study demonstrates the significant role that line blanketing plays in affec…
Heliospheric and it astrospheric hydrogen absorption towards Sirius: no need for interstellar hot gas
Lallement, R.; Izmodenov, V. V.; Malama, Y. G.
We use an updated self-consistent kinetic/gasdynamic model of the solar wind/interstellar flow interaction to compute the Lyman-alpha absorption by hydrogen atoms of both interstellar and solar origin generated in the heliospheric interface. We apply this model to the direction of the star Sirius. We show that the neutralized, compressed solar win…
Detection of warm SO_2 gas in oxygen-rich AGB stars
Waters, L. B. F. M.; Onaka, T.; Yamamura, I. +2 more
We report the discovery of the nu_3 band of SO_2 at 7.3 mu m in the ISO/SWS spectra of oxygen-rich AGB stars. The band is clearly detected in three stars, UX Cyg, o Cet and T Cep, and marginally detected in at least four other stars. The band is seen in absorption in UX Cyg, while it is in emission in o Cet. Seven spectra of T Cep taken at differe…