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
Abstract
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.
Subjects
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

Hamann, W.-R. 1985, A&A, 145, 443 Morris, P. W. 1995, Ph.D. Thesis, University of Colorado at Hamann, W.-R., & Koesterke, L. 1998, A&A, 333, 251 Boulder

Hamann, W.-R., Wessolowski, U., & Koesterke, L. 1994, A&A, Nugis, T., Crowther, P. A., & Willis, A. J. 1998, A&A, 333, 281, 184 956

Hillier, D. J. 1984, ApJ, 280, 744 Puls, J., & Hummer, D. G. 1988, A&A, 191, 87 Hillier, D. J. 1991, A&A, 247, 455 Schmutz, W., Hamann, W.-R., & Wessolowski, U. 1989, A&A, Lamers, H. J. G. L. M., & Waters, L. B. F. M. 1984, A&A, 210, 236 136, 37 Schmutz, W., Abbott, D. C., Russell, R. S., Hamann, W. R., Lamers, H. J. G. L. M., & Cassinelli, J. P. 1999, Introduction & Wessolowski, U. 1990, ApJ, 355, 255 to stellar winds (Cambridge University Press) van der Hucht, K. A. 2001, NewAR, 45, 135 Leitherer, C. 1988, ApJ, 326, 356 van der Hucht, K. A., Hidayat, B., Admiranto, A. G., Supelli, Lepine, S., & Mo at, A. F. J. 1999, ApJ, 514, 909 K. R., & Doom, C. 1988, A&A, 199, 217 Morris, P., Conti, P. S., Lamers, H. J. G. L. M., & Waters, L. B. F. M., & Lamers, H. J. G. L. M. 1984, A&AS, Koenigsberger, G. 1993, ApJ, 414, L25 57, 327

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