Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..666o&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 666-670.
Astronomy and Astrophysics
Astrophysics
26
Abundance, Chemical Composition, Quasars, Stellar Spectra, Anomalies, Carbon, Emission Spectra, Line Spectra, Nitrogen, Stellar Spectrophotometry
Scientific paper
The paper examines Q0353-383 which is in the most unusual quasar in the -40 deg zone of the Curtis Schmidt survey. It has many prominent lines of semi-forbidden N II, N IV, and N V lines, and abnormally weak semi-forbidden C III and C IV lines. Calibrated spectrophotometry of Q0353-383 together with Shield's models shows that the best explanation of the spectrum is a factor of 10 enhancement in the N/C ratio; the large N/C ratio is primarily due to a low abundance of carbon rather than a high abundance of nitrogen, which is not in accord with the standard picture of chemical abundances in the nuclear regions of galaxies. Of the 80 quasars in the Curtis Schmidt sample measured C IV/(L alpha + NV) line ratios Q0353-383 has the lowest value, so that a crude estimate of the frequency of such quasars is of the order of 1%.
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