Search Publications
The combination of ground-based astrometric compilation catalogues with the HIPPARCOS Catalogue. II. Long-term predictions and short-term predictions
Wielen, R.; Dettbarn, C.; Lenhardt, H. +1 more
The combination of ground-based astrometric compilation catalogues, such as the FK5 or the GC, with the results of the ESA Astrometric Satellite HIPPARCOS produces for many thousands of stars proper motions which are significantly more accurate than the proper motions derived from the HIPPARCOS observations alone. In Paper I (Wielen, et al. 1999, …
Period-Luminosity-Colour distribution and classification of galactic oxygen-rich LPVs II. Confrontation with pulsation models
Luri, X.; Barthès, D.
The kinematic and Period-Luminosity-Colour distribution of O-rich Long-Period Variable (LPV) stars of the solar neighbourhood is interpreted in terms of pulsation modes, masses and metallicities. It is first shown that, because of input physics imperfections, the periods and mean colours derived from the existing linear and nonlinear nonadiabatic …
Investigation of the Magellanic eclipsing binary HV 2241
Morrell, N. I.; Ostrov, P. G.; Lapasset, E.
We present a CCD V light curve of
The zeta Herculis binary system revisited. Calibration and seismology
Provost, J.; Berthomieu, G.; Morel, P. +1 more
We have revisited the calibration of the visual binary system zeta Herculis with the goal to give the seismological properties of the G0 IV sub-giant zeta Her A. The sum of masses and the mass fraction are derived from the most recent astrometric data mostly based on the HIPPARCOS ones. We have derived the effective temperatures, the luminosities …
CCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue III. CCD photometry and differential astrometry for 253 southern ``intermediate'' systems
Lampens, P.; Oblak, E.; Duval, D. +1 more
We present new astrometric and photometric data for 253 visual double stars of the ``intermediate'' class, i.e. with angular separations in the range 1 to 15 arcsec. The multi-colour observations were obtained in 1992-94 as part of the ESO Key Programme ``Visual Double Stars'' performed at La Silla Observatory (Chile). Differential magnitudes and …
Coronal restructuring and electron acceleration following a filament eruption
Klein, K. -L.; Marqué, Ch.; Lantos, P. +1 more
We present a multi wavelength observation of a filament eruption occurring on September 2nd 1999. The slow pre-event evolution of the filament ends with energy release signaled by a faint radio burst observed with the Nançay Radioheliograph and a faint LDE. The restructuring of a large area around the site of the eruption was monitored both with S…
An ISO investigation of the MWC 297 circumstellar region
Benedettini, M.; Pezzuto, S.; Lorenzetti, D. +2 more
The ISO-SWS full grating spectrum (2.3-45 mu m) of the Herbig Be star MWC 297 is presented. The spectrum is dominated by a strong continuum with superimposed emission lines and features both in absorption and in emission. In particular, we detect in emission 23 H I recombination, lines of the Brackett, Pfund and Humphreys series and four PAH featu…
Systematic relations between the HIPPARCOS catalogue and major (fundamental) catalogues of the 20th century (Paper I)
Schwan, H.
This paper presents the systematic relations between the HIPPARCOS catalogue and some major catalogues of the 20th century, preferentially fundamental catalogues. These relations allow one to reduce observations given in the system of one of these catalogues to the HIPPARCOS system. Software for performing such a transition can be downloaded from …
Disks around hot stars in the Trifid nebula
Cernicharo, J.; Cesarsky, D.; Lefloch, B. +2 more
We report on mid-IR observations of the central region in the Trifid nebula, carried out with ISOCAM in several broad-band infrared filters and in the low resolution spectroscopic mode provided by the circular variable filter. Analysis of the emission indicates the presence of a hot dust component (500 to 1000 K) and a warm dust component at lower…
A study of the chromospherically active binaries UX Fornacis and AG Doradus
Strassmeier, K. G.; Washuettl, A.
This paper presents a time-series spectrum analysis of the two chromospherically active binary stars, UX Fornacis and AG Doradus. To investigate the rotational behaviour, in combination with activity in the Hα line, we obtained almost 40 high-resolution, high-S/N spectra for each system. Both binaries, UX For and AG Dor, show Hα of the primary sta…