Abstract
For white dwarfs with effective temperatures smaller than 12000 K, the percentage of objects with a helium-rich atmosphere increases compared to the hydrogen-rich sequence. The carbon abundance, which can be determined from line and band strengths (Bues, 1973; Koester et al., 1982), varies by more than a factor of 1000 within this class. Moreover, for the subclass of white dwarfs with strong magnetic fields, the abundance ratio of H/He differs from that of the DB and DA sequences. The hot star Feige 7, analyzed by Liebert et al. (1977), shows lines of hydrogen and helium at a comparable strength for a moderately strong field of 103 Tesla. If there is any chance of finding white dwarfs which are descendants of hot, non-degenerate helium stars with rotation and magnetic fields, then it should be within these objects of mixed composition.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Bues, I.: 1973, Astron. Astrophys. 28, 181
Koester, D., Weidemann, V., Zeidler-K.T., E.-M.: 1982, Astron. Astrophys. 116, 147
Landstreet, J.D.: 1982, private communication
Liebert, J.: 1976, P.A.S.P. 88, 490
Liebert, J., Angel, J.R.P., Stockman, H.S., Spinrad, H., Beaver, E.A.: 1977, Astrophys. J. 214, 457
Rupprecht, G.: 1983, Ph.D. Thesis, Universität Erlangen-Nürnberg
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1986 D. Reidel Publishing Company
About this chapter
Cite this chapter
Bues, I. (1986). Line Band Profiles in the Spectra of Cool Magnetic Helium-Rich White Dwarfs. In: Hunger, K., Schönberner, D., Rao, N.K. (eds) Hydrogen Deficient Stars and Related Objects. Astrophysics and Space Science Library, vol 128. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4744-3_43
Download citation
DOI: https://doi.org/10.1007/978-94-009-4744-3_43
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8608-0
Online ISBN: 978-94-009-4744-3
eBook Packages: Springer Book Archive