Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1063u&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Sept. 1989, p. 1063-1068. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
10
Emission Spectra, Line Spectra, O Stars, Stellar Spectra, Visible Spectrum, Carbon, Electron Recombination, Helium, Nitrogen Ions, Plasma Spectra, Wolf-Rayet Stars
Scientific paper
Rectified, normalized, high S/N intensity tracings of nine Of stars were obtained from Reticon spectra in the 4550-4800-A region. The well-known relatively sharp Of emission lines are seen to stand on pedestals of broad weak emission somewhat like the broad emission lines from WR stars. It is suggested that cascades following dielectronic recombination may be an important process driving some lines of N III, C III, and C IV into the emission of Of stars, and that the sharp Of lines come from plasma that is stationary with respect to the star. The broad emission features show an extensive low-density wind from each star. The results imply that the detection of two, more or less equal, broad jumps in the rest spectra of galaxies at about 4640 and 4686 A is more indicative of Of stars than of WR stars.
Gilroy Kalpana Krishnaswamy
Hill Grant Michael
Underhill Anne. B.
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