Comparaison spectroscopique entre la bordure et le centre de M 57 (Luc Caron)

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Comparaison spectroscopique entre la bordure et le centre de M 57

Link: https://groupecoamnd.wixsite.com/website

Comparaison spectroscopique entre la bordure et le centre de M 57

Link: https://groupecoamnd.wixsite.com/website

j'ai pris deux spectres de M 57. Un premier où la fente du spectro est placée au centre de la nébuleuse et un deuxième en bordure. Comme vous le savez M 57 est une bulle dont les bords semblent plus denses car on voit alors dans le sens de l'épaisseur de la bulle. Au centre de l'anneau, la matière est beaucoup plus ténue puisqu'on regarde directement face à la bulle en expansion. Ce que l'on remarque en comparant les deux spectres :
1) les raies d'émission de l'oxygène et de l'azote sont plus intenses ce qui fait sens en raison de la plus grande quantité de matière en émission.
2) les composantes N2 6583 et 6548, qui sont en majeure partie responsables de la couleur rouge de l'anneau, sont en plus grandes proportions par rapport à la composante Ha. Ça irait dans le sens que l'anneau nous paraît plus rouge que le centre.

I took two spectra of M 57. A first where the slit of the spectro is placed in the center of the nebula and a second at the edge. As you know M 57 is a bubble whose edges seem denser because we can then see in the direction of the thickness of the bubble. In the center of the ring, the material is much thinner since you are looking directly at the expanding bubble. What we notice when comparing the two spectra:
1) Oxygen and Nitrogen emission lines are more intense which makes sense due to the greater amount of matter emitting.
2) the N2 components 6583 and 6548, which are mainly responsible for the red color of the ring, are in greater proportions compared to the Ha component. It would mean that the ring seems redder to us than the center.

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Comparaison spectroscopique entre la bordure et le centre de M 57

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