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Mid infrared emission of nearby Herbig Ae/Be stars
Prusti, T.; Siebenmorgen, R.; Müller, T. G. +1 more
We present mid IR spectro-photometric imaging of a sample of eight nearby (D <= 240 pc) Herbig Ae/Be stars. The spectra are dominated by photospheric emission (HR6000), featureless infrared excess emission (T Cha), broad silicate emission feature (HR5999) and the infrared emission bands (HD 97048, HD 97300, TY CrA, HD 176386). The spectrum o…
NLTE spectral analysis of the sdOB primary of the eclipsing binary system LB 3459 (AA Dor)
Rauch, T.
We present a spectral analysis of the sdOB primary star of the binary system
ISO results on bright Main Belt asteroids: PHT-S observations
Barucci, M. A.; Lellouch, E.; Crovisier, J. +8 more
Observations of asteroids have been performed by the ISO satellite with PHT-S. The aim of these observations was to investigate the physical and compositional properties of five bright Main Belt Asteroids (1 Ceres, 2 Pallas, 3 Juno, 4 Vesta, and 52 Europa) in the spectral range 5.8-11.6 mu m. The Standard Thermal Model and a black-body fit have be…
Angle dependent partial frequency redistribution in the interplanetary medium at Lyman alpha
Quémerais, E.
We present here the results of a model of multiple scattering at Lyman alpha in the interplanetary medium. This paper uses the formalism of Angle Dependent Partial Frequency Redistribution which allows a computation of the actual line profile for a hydrogen velocity distribution taking into account actual local velocities and temperatures. This wo…
Outflow velocity of interplume regions at the base of Polar Coronal Holes
Vial, J. -C.; Patsourakos, S.
We report on SUMER/SOHO observations at 1.05 Rsun of a well identified interplume region in a South Pole Coronal Hole. Combination of Doppler shifts and Doppler dimming measurements allowed to determine, for the first time, the total wind outflow velocity (~ 67 km s-1) at this height. Our calculations of the outflow velocity …
Strong spectral variability in NGC 7603 over 20 years
Dietrich, M.; Kollatschny, W.; Bischoff, K.
We present results of a long-term optical variability campaign on the Seyfert 1 galaxy NGC 7603 over a period of nearly 20 years. The optical continuum and the Balmer and Helium lines varied by a factor of 5 to 10 in this broad-line Seyfert 1 galaxy. Furthermore, it is remarkable that the optical FeII line blends varied with the same amplitude as …
The visual double stars observed by the Hipparcos satellite
Nys, O.; Dommanget, J.
This paper is the introduction to the complete and correct list of all systems or individual components known in July 1997 which were observed by the Hipparcos satellite. The list concerns 18644 double or multiple systems and may be found at the CDS under reference I-260. Its format is the same as that used in the CCDM catalogue (Dommanget & N…
Abundance in the planetary nebulae NGC 6537 and He2-111
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A.
The ISO and IUE spectra of the bipolar planetary nebulae NGC 6537 and He2-111 are presented. These spectra are combined with the spectrum in the visual wavelength region from the nebulae to obtain a complete spectrum that is corrected for extinction. The chemical abundance of the nebulae is then determined and compared to previous determinations. …
The Vega phenomenon around G dwarfs
Dominik, C.; Mayor, M.; Waelkens, C. +2 more
In this paper, we present and discuss photometric infrared measurements taken with ISOPHOT at 60 mu m for a sample of 30 G dwarfs, using C100 3X3 minimaps. This sample was selected from the set of more than 1600 G dwarfs which will be scrutinized for radial-velocity variations by the Geneva group, aiming at the detection of extra-solar planets. In…
Silicate emission in Orion
Lequeux, J.; Cesarsky, D.; Jones, A. P. +1 more
We present mid-infrared spectro-imagery and high-resolution spectroscopy of the Orion bar and of a region in the Orion nebula. These observations have been obtained in the Guaranteed Time with the Circular Variable Filters of the ISO camera (CAM-CVF) and with the Short Wavelength Spectrometer (SWS), on board the European Infrared Space Observatory…