Detection of non-radial g-mode pulsations in the newly discovered PG 1159 star HE 1429-1209

Free access article

Issue		A&A Volume 426, Number 2, November I 2004


Page(s)		L45 - L48
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200400079

A&A 426, L45-L48 (2004)
DOI: 10.1051/0004-6361:200400079

Letter

Detection of non-radial g-mode pulsations in the newly discovered PG 1159 star HE 1429-1209

T. Nagel and K. Werner

Institut für Astronomie und Astrophysik, Abteilung Astronomie, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
e-mail: nagel@astro.uni-tuebingen.de

(Received 23 August 2004 / Accepted 10 September 2004)

Abstract
We performed time-series photometry of the PG 1159-type star HE 1429-1209 , which was recently discovered in the ESO SPY survey. We show that the star is a low-amplitude ( $\approx$ 0.05 mag) non-radial g-mode pulsator with a period of 919 s. HE 1429-1209 is among the hottest known post-AGB stars ( $\mbox{$T_\mathrm{eff}$ }= 160\,000$ 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.

Key words: stars: white dwarfs -- stars: individual: HE 1429-1209 -- stars: variables: GW Vir -- stars: AGB and post-AGB

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