Ultraviolet spectral morphology of the O stars - The remarkable luminosity dependence of the SI IV stellar wind effect

Details Ultraviolet spectral morphology of the O stars - The remarkable luminosity dependence of the SI IV stellar wind effect Ultraviolet spectral morphology of the O stars - The remarkable luminosity dependence of the SI IV stellar wind effect

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280l..27w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 280, May 1, 1984, p. L27-L30.

Astronomy and Astrophysics

Astronomy

88

O Stars, Stellar Luminosity, Stellar Spectra, Stellar Structure, Stellar Winds, Ultraviolet Astronomy, Early Stars, Iue, Silicon, Spectral Line Width

Scientific paper

An extensive survey of ultraviolet O type spectra, by means of high-resolution data from the International Ultraviolet Explorer archives, shows a strong correlation between both the photospheric and stellar wind features, and the optical spectral types. In particular, the stellar wind effect in the Si IV resonance doublet displays a strong luminosity dependence which has not been completely described before: there is no effect anywhere on the main sequence, but it develops gradually through the intermediate luminosity classes into a full P Cygni profile in the supergiants. This behavior is in sharp contrast to that of the C IV and N V, which have strong P Cygni profiles throughout most of the O type domain, including the main sequence. The Si IV effect simultaneously provides a sensitive classification criterion and poses an outstanding problem for detailed astrophysical interpretation. In addition, a new emission feature at 1574 A, possibly due to N III or to N IV forbidden line, is reported.

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