Abundance of carbon and magnesium in the Orion nebula
The Orion nebula has been observed in two positions with IUE (International Ultraviolet Explorer) in the low-resolution mode (approx.7 A) and in the spectral range 1150--3200 A. Emission lines of C II), C III), (O II), and He I have been measured and used to determine what is probably the first reliable abundance of carbon in H II regions. The logarithmic total abundance of carbon is found to be 8.4 close to the solar value. In contrast with the situation in the planetary nebula of similar excitation, IC 418, where the resonance Mg II lambda2800 line is observed to be relatively strong, in the Orion nebula the lambda2800 line is not detectable. an upper limit for the magnesium abundance of the order of 10 times smaller than in the Sun is suggested.
- Research Organization:
- Osservatorio Astrofisico di Arcetri, Italy
- OSTI ID:
- 5614506
- Journal Information:
- Astrophys. J., Lett. Ed.; (United States), Vol. 235:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
NEBULAE
CARBON IONS
MAGNESIUM IONS
ULTRAVIOLET SPECTRA
ABUNDANCE
EMISSION SPECTRA
EXCITED STATES
H2 REGIONS
IONIZATION
PLANETARY NEBULAE
ATOMIC IONS
CHARGED PARTICLES
COSMIC RADIO SOURCES
ENERGY LEVELS
IONS
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies