On the Baldwin effect of He ii emission lines in WR (WN) stars

Details On the Baldwin effect of He ii emission lines in WR (WN) stars On the Baldwin effect of He ii emission lines in WR (WN) stars

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.

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