Peculiarities of the chemical abundance distribution in galaxies NGC
  3963 and NGC 7292
  Spectroscopic observations of 32 HII regions in the spiral galaxy NGC 3963
and the barred irregular galaxy NGC 7292 were carried out with the 2.5-m
telescope of the Caucasus Mountain Observatory of the Sternberg Astronomical
Institute using the Transient Double-beam Spectrograph with a dispersion of
1A/pixel and a spectral resolution of 3A. These observations were used to
estimate the oxygen and nitrogen abundances and the electron temperatures in
HII regions through modern strong-line methods. In general, the galaxies have
oxygen and nitrogen abundances typical of stellar systems with similar
luminosities, sizes, and morphology. However, we have found some peculiarities
in chemical abundance distributions in both galaxies. The distorted outer
segment of the southern arm of NGC 3963 shows an excess oxygen and nitrogen
abundances. Chemical elements abundances in NGC 7292 are constant and do not
depend on the galactocentric distance. These peculiarities can be explained in
terms of external gas accretion in the case of NGC 3963 and major merging for
NGC 7292.
