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

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.

4 pages, 4 figures, to be published in A&A

References in corpus (2)

• Far-UV Spectroscopic Analyses of Four Central Stars of Planetary Nebulae
• Identification of a DO White Dwarf and a PG1159 Star in the ESO SN Ia Progenitor Survey (SPY)

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• Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
• New nonadiabatic pulsation computations on full PG1159 evolutionary models: the theoretical GW Vir instability strip revisited
• Discovery of fourteen new ZZ Cetis with SOAR
• On the excitation of PG1159-type pulsations
• SDSSJ212531.92-010745.9 - the first definite PG1159 close binary system
• Astrophysics in 2005