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See detailAstrometric orbits of SB^9 stars
Jancart, Sylvie ULg; Jorissen, A.; Babusiaux, C. et al

in Astronomy and Astrophysics (2005), 442

Hipparcos Intermediate Astrometric Data (IAD) have been used to derive astrometric orbital elements for spectroscopic binaries from the newly released Ninth Catalogue of Spectroscopic Binary Orbits (S[SUB ... [more ▼]

Hipparcos Intermediate Astrometric Data (IAD) have been used to derive astrometric orbital elements for spectroscopic binaries from the newly released Ninth Catalogue of Spectroscopic Binary Orbits (S[SUB]B^9[/SUB]). This endeavour is justified by the fact that (i) the astrometric orbital motion is often difficult to detect without the prior knowledge of the spectroscopic orbital elements, and (ii) such knowledge was not available at the time of the construction of the Hipparcos Catalogue for the spectroscopic binaries which were recently added to the S[SUB]B^9[/SUB] catalogue. Among the 1374 binaries from S[SUB]B^9[/SUB] which have an HIP entry (excluding binaries with visual companions, or DMSA/C in the Double and Multiple Stars Annex), 282 have detectable orbital astrometric motion (at the 5% significance level). Among those, only 70 have astrometric orbital elements that are reliably determined (according to specific statistical tests), and for the first time for 20 systems. This represents a 8.5% increase of the number of astrometric systems with known orbital elements (The Double and Multiple Systems Annex contains 235 of those DMSA/O systems). The detection of the astrometric orbital motion when the Hipparcos IAD are supplemented by the spectroscopic orbital elements is close to 100% for binaries with only one visible component, provided that the period is in the 50-1000 d range and the parallax is >5 mas. This result is an interesting testbed to guide the choice of algorithms and statistical tests to be used in the search for astrometric binaries during the forthcoming ESA Gaia mission. Finally, orbital inclinations provided by the present analysis have been used to derive several astrophysical quantities. For instance, 29 among the 70 systems with reliable astrometric orbital elements involve main sequence stars for which the companion mass could be derived. Some interesting conclusions may be drawn from this new set of stellar masses, like the enigmatic nature of the companion to the Hyades F dwarf HIP 20935. This system has a mass ratio of 0.98 but the companion remains elusive. [less ▲]

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See detailEl astronauta en el mesón
Ceballos Viro, Alvaro ULg

in Juan PÉREZ ZÚÑIGA, Seis días fuera del mundo (Viaje inoluntario) / Sei giorni fuori dal mondo (Viaggio involontario) (2011)

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See detailAstronomers Meet in Isfahan
Heyn, Herman M; Nazé, Yaël ULg

Article for general public (2001)

Not Available

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See detailAstronomes célèbres et astronomes moins connus ... (1) William Herschel
Biémont, Emile ULg

in Galactée (2003), 34

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See detailAstronomes célèbres et astronomes moins connus ... (2) Les Cassini
Biémont, Emile ULg

in Galactée (2003), 35

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See detailAstronomes célèbres et astronomes moins connus ... (3) Hipparque
Biémont, Emile ULg

in Galactée (2003), 35

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See detailAstronomes célèbres et astronomes moins connus ... (4) Bailly
Biémont, Emile ULg

in Galactée (2004), 40

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See detailAstronomes célèbres et astronomes moins connus ... (5) Hubble
Biémont, Emile ULg

in Galactée (2004), 43

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See detailAstronomes célèbres et astronomes moins connus ... (6) John Flamsteed
Biémont, Emile ULg

in Galactée (2005), 46

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See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in American Geophysical Union Fall Meeting, Abstract (2013)

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See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Whalen; Osadetz; Richards (Eds.) et al IGCP-580/596, Geophysical and Geochemical techniques: a window on the Paleozoic world, Abstract book (2013)

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See detailAstronomical Optics -- D. J. Schroeder
Manfroid, Jean ULg

in Ciel et Terre (1988), 104

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See detailAstronomical photographic atlas
Heck, Andre; Manfroid, Jean ULg

Book published by Desoer (1977)

Not Available

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See detailAstronomical Photometry, A Guide
Sterken, Christiaan; Manfroid, Jean ULg

Book (1992)

Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools ... [more ▼]

Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools for the contemporary observer. This development of higher quality and more sensitive equipment makes it very necessary to improve the accuracy of the measurements. This guide helps the astronomer and astronomy student to improve the quality of their photometric measurements and to extract a maximum of information from their observations. The book is based on the authors' observing experience, spending numerious nights behind various instruments at many different observatories. [less ▲]

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See detailAn astronomical survey conducted in Belgium
Nazé, Yaël ULg; Fontaine, Sébastien ULg

in Physics Education (2014), 49

This article presents the results of the first survey conducted in Belgium about the interest and knowledge in astronomy. Two samples were studied, the public at large (667 questionnaires) and students ... [more ▼]

This article presents the results of the first survey conducted in Belgium about the interest and knowledge in astronomy. Two samples were studied, the public at large (667 questionnaires) and students (2589 questionnaires), but the results are generally similar in both samples. We evaluated people’s interest, main information source, and attitudes towards astronomy, as well as their supposed and actual knowledge of the subject. The main conclusion is that, despite a poor self-confidence, people do know the basic astronomical concepts. However, that knowledge is not deeply rooted, as reasoning questions show well-spread misconceptions and/or misunderstandings. [less ▲]

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See detailL'astronomie au quotidien -- G. Leblanc et J. Lomont
Manfroid, Jean ULg

in Ciel et Terre (1989), 105

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See detailL'astronomie au temps de Kepler
Le Paige, Constantin ULg

Speech (1896)

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See detailAstronomie CCD -- C. Buyl
Manfroid, Jean ULg

in Ciel et Terre (1990), 106

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See detailAstronomie dans le monde
Manfroid, Jean ULg

Article for general public (2011)

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See detailL'astronomie dans le monde - 01
Manfroid, Jean ULg

Article for general public (2013)

Polaris; Trou noir géant; Jet record; Mercure; Makémaké

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