Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...372..963v&link_type=abstract
Astronomy and Astrophysics, v.372, p.963-980 (2001)
Astronomy and Astrophysics
Astrophysics
2
Stars: Atmospheres, Stars: Emission Line, Stars: Wolf-Rayet
Scientific paper
We investigate the relation between the equivalent width of He ii emission lines and the monochromatic continuum luminosity at the line wavelength in the spectra of Wolf-Rayet stars. Model stellar atmospheres and spectra are used to show that the equivalent width inversely correlates with the monochromatic continuum luminosity. We find the effect in Wolf-Rayet star models over a large range of stellar parameters. The effect is shown to be connected to density differences among Wolf-Rayet star winds. The conclusion is drawn that the Baldwin effect may provide a new method for the determination of Wolf-Rayet star distances.
de Koter Alex
Lamers Henny J. G. L. M.
Morris Pat W.
van Gent J. I.
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