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Observations des bords brillants dans NGC 281, IC 434 et M 16

Observations of bright rims in NGC 281, IC 434 and M 16

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Les photographies monochromatiques en Hα, [Nii] λ 6584 et [Oiii] λ 5007 ont été obtenues sur NGC 281, IC 434 et M 16 eu vue de la détection et de l'étude des bords brillants. A partir de ces photos, on accède à la carte d'égal rapport [Nii]/Hα grâce à la méthode décrite par Louise et Sapin (1972). A l'exclusion des bords brillants, ce rapport varie très peu à l'intérieur d'une même nébuleuse. Par contre à l'approche des fronts d'ionisation, il augmente de façon spectaculaire et systématique.

Le renforcement de la raie [Oiii] vers les bords brillants suggère la présence des inhomogénéités (globules ou/et filaments) et le rôle possible que jouent les mécanismes d'échange de charges étudiés par Aller et Keyes (1980).

Abstract

Monochromatic plates are obtained in Hα, [Nii] λ 6584 and [Oiii] λ 5007 lines for three Hii regions: NGC 281, IC 434 and M 16. They allow both detection and physical studies of bright rims. Indeed, it is shown that bright rims appear most contrasted on [Nii] and [Oiii] plates. Furthermore, maps of ratio [Nii]/Hα are derived from the method described by Louise and Sapin (1972). This ratio remains practically constant within the nebula, except for bright rims where it increases. This may be understood by means of both increasing abundanceN(N+/N(H+) and temperature following to the model of Mallik (1975).

The [Oiii] enhancement towards bright rims in M 16 suggests the presence of inhomogeneities (globules or/and filaments) and the possible role played by charge exchange mechanisms as pointed out by Aller and Keyes (1980).

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Authors and Affiliations

  1. Observatoire de Marseille, Marseille, France

    R. Louise

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  1. R. Louise
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Louise, R. Observations des bords brillants dans NGC 281, IC 434 et M 16. Astrophys Space Sci 85, 405–417 (1982). https://doi.org/10.1007/BF00653462

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  • DOI: https://doi.org/10.1007/BF00653462

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