Confining the edges of the GW Vir instability strip

K. Werner1, S.Dreizler1, U.Heber2, T.Rauch1

1Institut für Astronomie und Astrophysik der Universität, D-24098 Kiel, Germany
2Dr. Remeis Sternwarte, Universität Erlangen-Nürnberg, 96049-Bamberg, Germany

We report on our NLTE model atmosphere analyses of PG 1159 stars. The results enable us to confine the location of the GW Vir 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=140000 K for stars in the respective luminosity range.

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