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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

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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