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See detailVibrational stability of G plus modes towards non-radial oscillations for solar models
Noels-Grötsch, Arlette ULg; Gabriel, Maurice ULg; Boury, A. et al

in Mémoires de la Societe Royale des Sciences de Liège (1975), 8

The vibrational stability of solar models towards g plus modes has been studied from the Zero Age Main Sequence (ZAMS) up to the age of 5 billion yr. The nuclear energy contribution to instability is ... [more ▼]

The vibrational stability of solar models towards g plus modes has been studied from the Zero Age Main Sequence (ZAMS) up to the age of 5 billion yr. The nuclear energy contribution to instability is calculated with the effective sensitivity of the reactions to change of temperature. The perturbation of convective terms is taken from an extension for nonradial oscillations of Unno's theory. The ZAMS model and the present sun are stable. However, for intermediate ages, models are unstable with respect to the lowest modes due to the effects of nuclear reactions. If, moreover, the mechanical effects of convection are taken into account, all models are unstable. However their theory is uncertain enough to require caution. [less ▲]

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See detailPhénomènes de fluorescence dans les astres.
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1971), 1

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See detailFree radicals in astrophysics.
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1969), XVIII(3), 7-26

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See detailConsideration of the forbidden lines of iron in the states from Fe0 to Fe6+
Swings, Polydore ULg; Swings, Jean-Pierre ULg

in Mémoires de la Societe Royale des Sciences de Liège (1969), 17

The iron atom which has a fairly high cosmic abundance presents the great interest of appearing in a wide variety of stars and nebulae, at many stages of ionization, and of revealing forbidden transitions ... [more ▼]

The iron atom which has a fairly high cosmic abundance presents the great interest of appearing in a wide variety of stars and nebulae, at many stages of ionization, and of revealing forbidden transitions in emission in many of these ionization stages. The present paper discusses the following topics : (a) the case of the as yet undiscovered forbidden lines of neutral iron (Fe0) ; (b) some recently acquired astronomical information on the forbidden lines of the stages Fe+ to Fe6+ ; (c) general considerations on the important information revealed by these forbidden lines of iron on the physical structure and excitation mechanisms which are present in the emission line stars of early and late types. For lack of time we give only a very summarized version of our paper ; a complete text will appear later. [less ▲]

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See detailConsidérations relatives à la distribution des conditions physiques au sein des atmosphères stellaires
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1938), III

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See detailSur la probabilité de désactivation par chocs intermoléculaires, dans le cas des émissions fluorescentes
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1931), XVI

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See detailNote sur un procédé simple permettant l'étude en laboratoire, des méthodes de photométrie stellaire photographique
Swings, Polydore ULg; Legros, A.

in Mémoires de la Societe Royale des Sciences de Liège (1930), XV

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See detailLettres à quelques mathématiciens (suite)
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1895), 18

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See detailLettres à quelques mathématiciens
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1892), 17

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See detailTraité des réductions stellaires
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1888), 2e série, t. 14

The author demonstrates the formulae on stellar reductions and puts them sheltered from the errors or the negligence that occur in the usual formulae, before making use of it for the determination of ... [more ▼]

The author demonstrates the formulae on stellar reductions and puts them sheltered from the errors or the negligence that occur in the usual formulae, before making use of it for the determination of constants nutation and annual aberration. [less ▲]

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See detailMélanges mathématiques (Tome troisième)
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1888), 15

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See detailMélanges mathématiques (Tome deuxième)
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1886), 13

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See detailMélanges mathématiques (Tome premier)
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1885), 12

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See detailDouze tables pour le calcul des réductions stellaires
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1883)

This publication contains twelve tables intended to facilitate various calculation of astronomical reductions: tables I to V that of the precession, tables VI to X that of the nutation and tables XI to ... [more ▼]

This publication contains twelve tables intended to facilitate various calculation of astronomical reductions: tables I to V that of the precession, tables VI to X that of the nutation and tables XI to XII that of some other usual reductions. [less ▲]

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See detailProblèmes et théorèmes d'arithmétique
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1883), 10

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See detailTables des lignes trigonométriques naturelles et des inverses des nombres
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1882), 2e série, t. 9

The author built a table of the natural trigonometric lines to calculate some astronomical reductions. It is arranged in two tables, one with the sine, cosine and tangent, the other with the secant or ... [more ▼]

The author built a table of the natural trigonometric lines to calculate some astronomical reductions. It is arranged in two tables, one with the sine, cosine and tangent, the other with the secant or cosecant cotangents. [less ▲]

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See detailEléments d'une théorie des faisceaux
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1878)

The author summarizes twelve years of studies on the geometry. He managed to extend to plane curves and to upper surfaces most of the fundamental theorems, which only applied to conics.

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See detailThéorie analytique des lignes à double courbure
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1877), 6

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See detailThéorèmes d'arithmétique
Catalan, Eugène ULg

in Mémoires de la Societe Royale des Sciences de Liège (1877), 6

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