Hostname: page-component-8448b6f56d-dnltx Total loading time: 0 Render date: 2024-04-20T01:16:27.226Z Has data issue: false hasContentIssue false
  • English
  • Français

Confining the Edges of the GW Vir Instability Strip

Published online by Cambridge University Press:  12 April 2016

Klaus Werner ,
Stefan Dreizler ,
Ulrich Heber  and
Thomas Rauch
Klaus Werner
Affiliation:
Institut für Astronomie und Astrophysik der Universität, 24098 Kiel, Germany
Stefan Dreizler
Affiliation:
Institut für Astronomie und Astrophysik der Universität, 24098 Kiel, Germany
Ulrich Heber
Affiliation:
Dr. Remeis Sternwarte, Universität Erlangen-Nürnberg, 96049 Bamberg, Germany
Thomas Rauch
Affiliation:
Institut für Astronomie und Astrophysik der Universität, 24098 Kiel, Germany

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We report on our NLTE model atmosphere analyses of PG 1159 stars. The results enable us to confine the location of the GWVir instability region in the Hertzsprung-Russell diagram. The analysis of a spectrum of the non-pulsator PG 1520+525 taken with the EUVE satellite in comparison with HST data of the pulsating protoype PG 1159-035 (=GW Vir) locates the blue edge of the instability strip near Teff=140 000 K for stars in the respective luminosity range.

Type
IV. White Dwarf Structure/Evolution
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 229 - 234
Copyright
Copyright © Kluwer 1996

References

Dreizler, S., Werner, K. & Heber, U. 1995, Analysis of PG 1159 stars and related objects, n White Dwarfs, ed. Koester, D. & Werner, K., Lect. Notes Phys., Springer, 443, 160 Google Scholar
Starrfield, S., Cox, A.N., Kidman, R.B., & Pesnell, W.D. 1984, Nonradial instability strips based on carbon and oxygen partial ionization in hot, evolved stars, ApJ, 281, 800 Google Scholar
Werner, K. & Heber, U. 1993, UV spectroscopy of PG1159 with HST and a prospective view of future EUVE observations, in White Dwarfs: Advances in Observation and Theory, ed. Barstow, M.A., Dordrecht: Kluwer, NATO ASI Series C., 403, 303 Google Scholar
Werner, K., Heber, U., Hunger, K. 1991, Non-LTE analysis of four PG1159 stars, A&A, 244, 437 Google Scholar