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M57 outer ring spectra

Technical card

Imaging telescope or lens:SkyWatcher Newton 150-750

Imaging camera:Atik 314L+

Mount:Sky-Watcher HEQ5

Guiding telescope or lens:SkyWatcher Newton 150-750

Guiding camera:ZWO Optical ASI120MM

Software:Astrobodger Bass v1.8.2

Filter:Shelyak Instruments Alpy 600

Resolution: 1400x1000

Dates: Aug. 12, 2016

Frames: 6x600"

Integration: 1.0 hours

Avg. Moon age: 8.95 days

Avg. Moon phase: 66.40%

Astrometry.net job: 1304805

Locations: OHP, Observatoire de Haute Provence, Haute Provence, France

Data source: Unknown

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

Author

Stef
Stephane Neveu
License: None (All rights reserved)
2043
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Histogram

M57 outer ring spectra, 




    

        Stephane Neveu