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Infrared Astrophysics in the Space with ISO From ISO to FIRST
Cernicharo, J.
I present some of the results we have obtained with the four instruments on board of the ISO satellite. The determination of water vapour abundance, the study of star forming regions and the determination of the physical and chemical conditions in evolved stars are discussed. The implication of these results for future space-based observatories li…
Parallaxes and Proper Motions of Prototypes of Astrophysically Interesting Classes of Stars
Kundu, Arunav; Trimble, Virginia
Hipparcos data are presented for 13 stars belonging to six different evolutionary types that present various puzzles. There are three FK Comae stars, one Wolf-Rayet binary, the ``galloping giant'' FG Sagittae, two high-velocity B stars, two runaway T Tauri stars, and four cataclysmic variables. Most of the numbers are of limited statistical signif…
ISO-LWS Observations of the NGC7129 Star Forming Region
Giannini, Teresa; Nisini, Brunella; Lorenzetti, Dario +2 more
We present far-infrared observations of the surroundings of the Herbig Be star LkHα234 in NGC7129, obtained with the Long Wavelength Spectrometer on board of the Infrared Space Observatory. [CII]158µm, [OI]63µm and [OI]146µm lines are detected everywhere in the mapped region and their intensity ratios are consistent with the model predictions of a…
Energetic solar particle dropouts detected by Ulysses at 1.63 AU: A possible encounter with the Earth's distant magnetotail
Phillips, John L.; Lin, Robert P.; Ashford, Stephen M. +2 more
Fast solar particles are used to trace the topology of the interplanetary magnetic field during a solar event detected by the heliosphere instrument for spectra composition and anisotropy at low energy (HISCALE) on the Ulysses spacecraft on January 2, 1991. Two sharp-edged dropouts, lasting for 10 and 25 min, were detected in the fluxes of solar i…
Prospects in astrometry and orbital determination of minor bodies
Carpino, M.
The astrometry of asteroids and comets is undergoing a significant progress, both in accuracy and number of observations, as a consequence of the introduction of CCD devices and the availability of stellar catalogues dense enough to cope with CCD relatively small fields of view. Further, substantial progress in accuracy is expected from the availa…
Determination of highly precise proper motions for 32 Hipparcos stars from photographic plates.
Wang, S.; Wang, J.; Jin, W. +1 more
The authors have reduced 70 exposures on 32 photographic plates taken in four areas of the sky around the radio source 0316+413, the galaxy NGC 7302, the Pleiades astrometric standard region, and so on with the 40-cm astrographic refractor at SheShan (Zô-Sé) Station of the Shanghai Observatory. Using the PPM catalogue as the initial reference cata…
Determination of T(eff) and log G for A0 type stars and its impact on the interpretation of the HR diagram with the HIPPARCOS results
Gomez, A.; Gerbaldi, M.; Faraggiana, R. +3 more
The determination of the "Fundamental Parameters" T(eff) and log g for a set of dwarf A0-type stars is discussed in terms of consistency when comparing these values determined through different methods. The position of these stars in the HR diagram are discussed, taking into account the HIPPARCOS data. A large number of binary stars with component…
Atmospheric parameters and abundances of lambda Bootis stars
Heiter, U.
The results of the abundance analyses of six lambda Bootis stars are presented. For three stars, the impact of individual ODFs and various treatments of convection in the calculations of the model atmospheres are investigated.
ISO-SWS Spectra of Carbon Stars: Molecular Features and a Comparison with Models
Jørgensen, U. G.; Hron, J.; Kerschbaum, F. +1 more
Mesures d'etoiles doubles effectuees a la lunette de 50 CM de l'Observatoire de Nice (2({) e. Measures of visual double stars made with the 50 CM refractor at the Nice Observatory (2^{nd
Thorel, J. -C.
66 measures of 38 visual double stars made at the Observatoire de la Cote d'Azur, at Nice, in september et december 1997, with the 50 cm equatorial refractor equipped with filar micrometer and electronic recording device. Observation programmes of stars suspected double and new binaries discovered by Hipparcos, and measures of double stars which h…