Les incompatibilites entre la theorie standard de l'extinction interstellaire et l'observation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Note soumise a l'Academie des Sciences, 7 pages, 2 figures, en francais

Scientific paper

The standard interpretation of the extinction curve does not agree with some observations. The light we receive from a reddened star must be contaminated by starlight scattered at very small angular distances from the star. The true extinction curve is a straight line from the near infrared to the far-UV. If so, all interstellar dust models must be questionned. A second conclusion is that the average properties of interstellar grains may be much more uniform than previously thought. -- L'interpretation standard de la courbe d'extinction de la lumiere par la matiere interstellaire n'est pas en accord avec certaines observations. Cela s'explique seulement si la lumiere des etoiles rougies est contaminee par de la lumiere diffusee a tres faible angle de diffusion. La courbe d'extinction exacte est alors une ligne droite du proche infrarouge jusqu'a l'UV lointain. Cela remet en question tous les modeles de poussiere utilises a l'heure actuelle. Il n'y a egalement pas lieu de supposer de variation des proprietes moyennes des grains d'une region de l'espace a l'autre.

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