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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 08/04

Detection of non-radial g-mode pulsations in the newly discovered PG1159 star HE 1429-1209

T. Nagel (1), K. Werner (1)

(1) Institut f. Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany

To be published in: A&A Letters

Abstract. We performed time-series photometry of the PG1159-type star HE 1429-1209, which was recently discovered in the ESO SPY survey. We show that the star is a low-amplitude (about 0.05 mag) non-radial g-mode pulsator with a period of 919s. HE 1429-1209 is among the hottest known post-AGB stars (Teff=160000 K) and, together with the known pulsator RX J2117.1+3412, it defines empirically the blue edge of the GW Vir instability strip in the HRD at high luminosities.

Preprint (192 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0409243

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