L'extinction interstellaire

Computer Science

Scientific paper

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Ism: Dust, Extinction, Ism: Lines And Bands

Scientific paper

Interstellar extinction, or the way interstellar dust extinguishes starlight and modifies its spectrum, is still today not fully understood.
This paper proposes a synthesis of the observations and results obtained during the fourty past years on interstellar extinction at visible and ultraviolet wavelengths. The difficulties met by current interpretations of the spectrum of reddened stars are analyzed. In regard of this analysis, observation suggests a large homogeneity of the extinction properties of interstellar matter in the universe. Observations also suggest an alternative to present interstellar dust models.
L'extinction interstellaire, c'est-à-dire la façon dont la matière interstellaire éteint la lumière des étoiles et modifie son spectre, possède des propriétés particulières aujourd'hui encore mal comprises.
Cet article propose une synthèse des observations et résultats obtenus ces quarante dernières années sur l'extinction interstellaire aux longueurs d'onde visibles et ultraviolettes. Il tente de déterminer les raisons des difficultés rencontrées par les interprétations courantes du spectre des étoiles rougies. Au regard de cette analyse, les observations indiquent une grande homogénéité des propriétés d'extinction du milieu interstellaire dans l'univers. Elles suggèrent aussi une alternative aux modèles de poussières interstellaires utilisés actuellement.

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