publication . Article . 2001

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

J. I. van Gent; H. J. G. L. M. Lamers; A. de Koter; P. W. Morris;
Open Access
  • Published: 04 Jun 2001
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.
arXiv: Astrophysics::Solar and Stellar AstrophysicsAstrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics::Earth and Planetary Astrophysics
free text keywords: Astronomy, Equivalent width, Stars, Emission spectrum, T Tauri star, Astrophysics, Physics, Flare star, Luminosity, K-type main-sequence star, Stellar atmosphere
Related Organizations

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