Two new ZZ Ceti pulsators from the HS and HE surveys

Details Two new ZZ Ceti pulsators from the HS and HE surveys Two new ZZ Ceti pulsators from the HS and HE surveys

2005-06-10

arxiv.org/abs/astro-ph/0506228v1

Astronomy and Astrophysics

Astrophysics

Astronomy & Astrophysics, submitted, 6 pages, 6 figures

Scientific paper

We report the detection of nonradial g-mode oscillations in the DA white dwarfs HS1039+4112 (B=15.9) and HE1429-0343 (B=15.8) from time-series photometry made at the Loiano 1.5 m telescope. The two stars were previously selected as probable pulsators based on two-color photometry and spectral analysis respectively. Following our temperature and surface gravity determinations, HS1039+4112 (Teff=11200 K, logg=8.2) is located near the red edge of the ZZ Ceti instability strip, whereas HE1429-0343 (Teff=11400 K, logg=7.8) falls in the middle of the strip. Both stars show a multi-mode behavior with the main periods at about 850 and 970 s respectively, and relatively large amplitudes (~7% and ~2.5%).

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