Abstract
Photoelectric spectrophotometry of emission lines in the 3700– 7400 Å range is presented for 12 regions of the Orion Nebula. The observations were obtained at CTIO with the 0.91- and 1.5-m telescopes and the Harvard scanner. Based on these observations the chemical composition is derived. The logarithmic abundances by number are H = 12.00, He = 11.00, C = 8.52, N = 7.76, 0 = 8.75, Ne = 7.90, S = 7.41, Cl = 5.15, Ar = 6.7. The presence of spatial temperature fluctuations has been taken into account and the helium lines have been corrected for resonance fluorescence produced by self-absorption from the 23S energy level. The abundances of C, N, O and Ne are very similar to the solar ones.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
