CN status of a sample of galactic OB supergiants

Details CN status of a sample of galactic OB supergiants CN status of a sample of galactic OB supergiants

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mshe.work...39s&link_type=abstract

"Proceedings of "Massive Stars and High-Energy Emission in OB Associations", a workshop of the JENAM 2005, "Distant Worlds", hel

Computer Science

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In our search for evidence for the CNO processed material in the atmospheres of galactic OB supergiants we measured the equivalent widths of photospheric lines in their high-resolution IUE spectra. A sample of 36 stars was investigated and the lines He II 1640, C III 1247, N IV 1718 and O IV 1339 were studied. All ions show a well-defined dependence on effective temperature. Comparison of stars with questionable CN status with normal stars gives evidence for a decrease in equivalent widths of C III and O IV lines accompanied by an increase in equivalent widths of N IV and He II lines, which leads to abundance differences.

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