Search Publications
An ISO and IUE study of planetary nebula NGC 2440
Pottasch, S. R.; Feibelman, W. A.; Bernard Salas, J. +1 more
The infrared and ultraviolet spectra of planetary nebula
A 2.4-12 mu m spectrophotometric study with ISO of Cygnus X-3 in quiescence
Ábrahám, P.; Fuchs, Y.; Koch-Miramond, L. +2 more
We present mid-infrared spectrophotometric results obtained with the ISO on the peculiar X-ray binary Cygnus X-3 in quiescence, at orbital phases 0.83 to 1.04. The 2.4-12 mu m continuum radiation observed with ISOPHOT-S can be explained by thermal free-free emission in an expanding wind with, above 6.5 mu m, a possible additional black-body compon…
Structure and evolution of FK Comae corona
Gondoin, P.; Lumb, D.; Erd, C.
FK Comae (HD 117555) is a rapidly rotating single G giant whose distinctive characteristics include a quasisinusoidal optical light curve and high X-ray luminosity. FK Comae was observed twice at two weeks interval in January 2001 by the XMM-Newton space observatory. Analysis results suggest a scenario where the corona of FK Comae is dominated by …
An analysis of STIS HST UV spectra of M 33 early B supergiants
Kudritzki, R. P.; Herrero, A.; Bresolin, F. +3 more
We present terminal velocities of M 33 B-supergiants, obtained from STIS HST spectra as part of our programme to investigate the Wind Momentum - Luminosity Relationship (WLR) in the Local Group. Terminal velocities are derived from their N V, C Iv, and Si Iv resonance lines in UV spectra. Comparing with IUE spectra of Galactic B-supergiants we fou…
The X-ray afterglow of GRB 020322
Ehle, M.; Watson, D.; O'Brien, P. T. +4 more
The spectrum of the afterglow of GRB 020322 is the highest-quality X-ray spectrum of a GRB afterglow available to date. It was detected by XMM-Newton in an observation starting fifteen hours after the GRB with a mean 0.2-10.0 keV observed flux of 3.5+/-0.2*E-13 erg cm-2 s-1, making it the brightest X-ray afterglow …
A 60 pc counter-rotating core in NGC 4621
Copin, Y.; Emsellem, E.; Wernli, F.
We present adaptive optics assisted OASIS integral field spectrography of the S0 galaxy NGC 4621. Two-dimensional stellar kinematical maps (mean velocity and dispersion) reveal the presence of a ~ 60 pc diameter counter-rotating core (CRC), the smallest observed to date. The OASIS data also suggests that the kinematic center of the CRC is slightly…
Comparing SWAS and ISO observations of water in outflows
Benedettini, M.; Goldsmith, P. F.; Nisini, B. +3 more
We present a detailed comparison of SWAS and ISO observations of H2O, emission in a sample of outflows. By taking into consideration the different methods used to derive the fractional water abundance, we find that, despite the initial apparent discrepancies, there is satisfactory agreement between ISO and SWAS results for the outflows …
The extended atmosphere and evolution of the RV Tau star, R Scuti
Zijlstra, A. A.; Bedding, T. R.; Yamamura, I. +1 more
We analyze ISO/SWS spectra of the RV Tau star R Scuti. The infrared spectra are dominated by H2O emission bands. The near- and mid-infrared excess is attributed to H2O; the dust contribution is less important. We also identify CO, SiO and CO2 bands. The various molecular emission bands originate from an extended at…
The lensing system towards the doubly imaged quasar SBS 1520+530
Bolzonella, M.; Faure, C.; Alloin, D. +3 more
The gravitational potential responsible for the lensing effect in SBS 1520+530, is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use sharply deconvolved Hubble Space Telescope images in the optical and near-IR, in combination with ground based optical data obtained over a wider field-of-view. In parti…
Far-infrared/millimetre emission in 3C sources. Dust in radio galaxies and quasars
Andreani, P.; Fosbury, R. A. E.; Freudling, W. +1 more
We present far-infrared and millimetric observations of a sample of 3C objects. Millimetre data were taken at 1.25 mm with the IRAM 30 m antenna feeding the MPIfR bolometer array. Mid-infrared (MIR) and far-infrared (FIR) photometry were carried out with the ISOCAM and ISOPHOT cameras on the ISO Satellite. Additional FIR IRAS observations are also…