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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…
Lyman-α imaging of the SO2 distribution on Io
Ballester, Gilda E.; Wolven, Brian C.; Feldman, Paul D. +7 more
Imaging spectroscopy of Io in the ultraviolet (1160-1720 Å) was carried out with the Space Telescope Imaging Spectrograph on HST on three dates in October 1997 and August 1998. Among the initial results was the observation of concentrated regions of Hi Lyman-α flux near the poles of Io that exhibited a morphology and temporal variability different…
Constraints on the Evolution of S0 Galaxies in Rich Clusters at Moderate Redshift
Smail, Ian; Couch, Warrick J.; Jones, Lewis
We combine morphological classifications from deep Hubble Space Telescope (HST) imaging of a sample of three clusters at z=0.31 and a further nine clusters at z=0.37-0.56 with existing spectroscopic observations of their elliptical (E) and S0 populations, in order to study the relative spectral properties of these two galaxy types. We have also us…
NICMOS images of JVAS/CLASS gravitational lens systems
Jackson, N.; Browne, I. W. A.; Xanthopoulos, E.
We present Hubble Space Telescope (HST) infrared images of four gravitational lens systems from the JVAS/CLASS gravitational lens survey and compare the new infrared HST pictures with previously published WFPC2 HST optical images and radio maps. Apart from the wealth of information that we get from the flux ratios and accurate positions and separa…
The Large Magellanic Cloud Eclipsing Binary HV 2274: Fundamental Properties and Comparison with Evolutionary Models
Fitzpatrick, Edward L.; Guinan, Edward F.; Ribas, Ignasi +6 more
We are carrying out an international, multiwavelength program to determine the fundamental properties and independent distance estimates of selected 14th to 15th magnitude eclipsing binaries in the Large and Small Magellanic Clouds (LMC and SMC). Eclipsing binaries with well-defined double-line radial velocity curves and light curves provide valua…
Thomson Thick X-Ray Absorption in a Broad Absorption Line Quasar, PG 0946+301
Arav, N.; Elvis, M.; Peterson, B. M. +14 more
We present a deep ASCA observation of a broad absorption line quasar (BALQSO) PG 0946+301. The source was clearly detected in one of the gas imaging spectrometers, but not in any other detector. If BALQSOs have intrinsic X-ray spectra similar to normal radio-quiet quasars, our observations imply that there is Thomson thick X-ray absorption (N…
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 …