The 'Baldwin Effect' in Wolf-Rayet stars

Details The 'Baldwin Effect' in Wolf-Rayet stars The 'Baldwin Effect' in Wolf-Rayet stars

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..25m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 1, p. L25-L28.

Astronomy and Astrophysics

Astrophysics

17

Emission Spectra, Stellar Luminosity, Stellar Spectra, Stellar Winds, Wolf-Rayet Stars, Astronomical Spectroscopy, Ionization, Line Spectra, Stellar Models

Scientific paper

The equivalent widths of a number of emission lines in the spectra of WN-type Wolf-Rayet stars are found to inversely correlate with the luminosity of the underlying continuum. This is the well-known Baldwin Effect that has previously been observed in quasars and some Seyfert I galaxies. The Effect can be inferred from line and continuum predictions in published non-LTE model helium atmospheres and is explainable in terms of differences in wind density among WN stars. Using a simple wind model, we show that the Effect arises from the fact that both the effective radius for the local continuum and the emission measure of the layers above the continuum-forming region depend on the density in the wind. The Effect provides a new method for distance determinations of W-R stars.

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