| Issue |
A&A
Volume 372, Number 3, June IV 2001
|
|
|---|---|---|
| Page(s) | 963 - 980 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20010534 | |
| Published online | 15 June 2001 | |
On the Baldwin effect of He ii emission lines in WR (WN) stars
1
Astronomical Institute, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
2
SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands e-mail: lamers@astro.uu.nl
3
Astronomical Institute "Anton Pannekoek" , University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands e-mail: dekoter@astro.uva.nl
4
California Institute of Technology, SIRTF Science Center, M/C 100-22, Pasadena CA 91125, USA e-mail: pmorris@ipac.caltech.edu
Corresponding author: J. van Gent, gent@astro.uu.nl
Received:
24
July
2000
Accepted:
6
April
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.
Key words: stars: atmospheres / stars: emission line / stars: Wolf-Rayet
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.