Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1032f&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Oct. 1986, p. 1032-1040.
Astronomy and Astrophysics
Astronomy
31
Abundance, Chemical Composition, Galactic Evolution, Spiral Galaxies, Stellar Mass, Electron Energy, H Ii Regions, Metallicity, Stellar Temperature
Scientific paper
Photoelectric spectrophotometry in the 3400 A-7400 A range is presented for five H II regions in the spiral galalxy NGC 2403. Steep gradients in the electron temperature, N/H, and O/H were found. By adopting the Y versus O/H relation the observations also imply gradients in neutral He/H(+). The maximum temperature of the most massive stars in giant H II regions across the disk of NGC 2403 is 35,000 K; this result implies that the mass of the most massive stars is very similar in each H II regioon and that it is independent of the gradient in heavy element abundances. By comparing the derived chemical abundances with models of galactic chemical evolution it is found that infall into the galactic disk is not important for NGC 2403.
Fierro Julieta
Peimbert Manuel
Torres-Peimbert Silvia
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