Géométrie de Roche

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

I discuss here the geometry of a close binary, described by the Roche potential. The three possible solutions, detached, semi-detached and contact systems, are presented. Ellipsoidal variations found in quiescent soft X-ray transients show that the secondary distortion is indeed quite detectable; they also can be used to constrain the primary mass, and, together with the spectroscopic determination of the mass function, are the only unambiguous evidences for the existence of black holes in LMXBs. Ce chapitre détaille la géométrie d'un système binaire serré, décrite par le potentiel de Roche. Les trois possibilités (système détaché, semi-détaché, en contact) sont présentées. Les variations ellipsoídales observées dans les systèmes transitoires X en quiescence montrent que les déformations de la secondaire sont parfaitement détectables elles permettent surtout de contraindre la masse de l'objet compact, et fournissent, avec la détermination par spectroscopie de la fonction de masse, les seules preuves indiscutables de l'existence de trous noirs dans les systèmes binaires X.

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