The abundance gradients across the spiral galaxies NGC 628 and NGC 6946

Details The abundance gradients across the spiral galaxies NGC 628 and NGC 6946 The abundance gradients across the spiral galaxies NGC 628 and NGC 6946

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...78...61b&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 78, Jan. 1992, p. 61-85. Research supported by Universite de Monc

Astronomy and Astrophysics

Astrophysics

89

H Alpha Line, H Beta Line, Imaging Spectrometers, Magnetohydrodynamic Stability, Spiral Galaxies, Stellar Coronas, Abundance, Charge Coupled Devices, H Ii Regions, Line Spectra

Scientific paper

Results are presented of imaging spectrophotometry in the nebular lines H-alpha, H-beta, forbidden N II, and forbidden O III performed of nearly 300 H II regions in the galaxies NGC 628 and NGC 6946. The reliability of the method for conducting spectrophotometry of H II is demonstrated, and several physical parameters related to the chemistry of the galaxies are derived. Reddening, H-beta emission equivalent widths, diagnostic line ratios, forbidden O III/H-beta and forbidden N II/forbidden O III, and O/H abundances were measured for 130 H II regions as far as 2.0 R(eff) in NGC 628, and for 160 H II regions as far as 1.4 R(eff) in NGC 6946. Neither reddening nor the H-beta equivalent widths display any trend as a function of radial distances from the galactic centers. The slope of the gradient is constant across the complete range of radial distances sampled in NGC 628. The O/H abundances of the central regions of NGC 6946 may be affected by the presence of a molecular and ionized gas bar.

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