Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158..266p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 266-272.
Astronomy and Astrophysics
Astrophysics
63
Astronomical Spectroscopy, Chemical Composition, Cosmochemistry, Galactic Evolution, Abundance, Electron Energy, Electrophotometry, H Ii Regions, Irregular Galaxies, Line Spectra, Stellar Mass, Ultraviolet Spectra, Visible Spectrum
Scientific paper
Photoelectric spectrophotometry in the 3400 - 7400 Å is presented for the metal-poor extragalactic H II region NGC 2363. Based on these data, on IUE observations and on ionization structure models the authors have obtained the chemical abundances. The C/O ratio is a factor of two smaller than in the solar vicinity and under reasonable assumptions implies that most of the C in the solar vicinity is produced by intermediate mass stars. The N/C ratio is the same in NGC 2363 and in the Orion nebula, but the N/H ratio is 17 times smaller than in the Orion nebula. From line ratios involving five He emission lines it is found that N(He)/N(H) = 0.077±0.006(3σ), which corresponds to Y = 0.235±0.013(3σ).
Peimbert Manuel
Peña Manuel
Torres-Peimbert Silvia
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