The ``Baldwin Effect'' in Wolf-Rayet Stars

Details The ``Baldwin Effect'' in Wolf-Rayet Stars The ``Baldwin Effect'' in Wolf-Rayet Stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.4623m&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #46.23; Bulletin of the American Astronomical Society, Vol. 25, p.877

Astronomy and Astrophysics

Astronomy

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 a similar dependence of the continuum (free-free) opacity and the line emission on density and temperature, ~ rho (2) T(-3/2) . The Effect provides a new method for distance determinations of W-R stars.

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