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See detailMétamorphoses à l'Université
Dubuisson, Marcel ULg

Speech (1956)

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See detailL'Astrophysique moléculaire
Swings, Polydore ULg

in Astronomie (L') (1956), 70

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See detailAtlas of representative cometary spectra
Swings, Polydore ULg; Haser, L.

Book published by Impr. Ceuterick (1956)

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See detailThe spectra of the comets
Swings, Polydore ULg

in Vistas in Astronomy (1956), 2

The Introduction deals with the essential information on the nucleus, the coma, and the tail of comets, which may be obtained by direct photography, photometry, and polarization techniques; the need for ... [more ▼]

The Introduction deals with the essential information on the nucleus, the coma, and the tail of comets, which may be obtained by direct photography, photometry, and polarization techniques; the need for "monochromatic" observations is emphasized. It is followed by a description of the emission spectrum of the coma (from the OH emission near 3100 to the red CN band near 8100) and by that of the spectrum of the tail in the ultraviolet and photographic regions, with emphasis on the recently discovered bands. The complex profile of the emission bands is shown to be due to a resonance fluorescence excitation, account being taken of the absorption lines of the exciting solar radiation; other possible excitation mechanisms are briefly mentioned. The probable assignment of the 4050 group to the tricarbon molecule and its consequences are discussed. The paper ends with physical considerations on the still unidentified emissions, on desirable physical investigations, on the parent molecules, and the production and evolution of cometary atmospheres, and on the densities and the extent of molecules in the cometary head. [less ▲]

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See detailIntroduction historique à l'étude des tourbières de la Fagne des Deux Séries
Bouillenne, R; Deuse, P; Streel, Maurice ULg

in Bulletin de la Société Royale des Sciences de Liège (1956), 5

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