M57 outer ring spectra, Stephane Neveu

M57 outer ring spectra

M57 outer ring spectra, Stephane Neveu

M57 outer ring spectra

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Description

M57 spectra.

Upper left :Autoguider enhanced image (SDSS colored)

Upper right : Part of the ring nebula used for this spectra

Lower part : synthetic colored spectra and elements

Nebula high excitation class (He line at 4686 A) : E7 or E8 with E = 2.05

Teff central star = 90 000 to 100 000 K

Ratio S II I(6716)/I(6731) = 1,0645339217

Giving approx up to Ne = 500 / cm3

Te from [N II] procedure gives :

Te [N II]= 11 500 K

Values for outer ring from

CHEMICAL ABUNDANCES AND KINEMATICS OF THE RING NEBULA AND ITS HALOS M. A. GUERRERO1 AND A. MANCHADO1- 1997 and Y.-H. CHU

(http://iopscience.iop.org/article/10.1086/304582/meta)

give :

Ne = 615

Te [N II] = 10240 K

Not so bad for that time..;-)

Comments

Histogram

M57 outer ring spectra, Stephane Neveu

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