Volume 443, Number 1, November III 2005
|Page(s)||195 - 199|
|Section||Stellar structure and evolution|
|Published online||21 October 2005|
Two new ZZ Ceti pulsators from the HS and HE surveys
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy e-mail: email@example.com
2 Institut für Theoretische Physik und Astrophysik der Universität Kiel, Leibnizstraße 15, 24098 Kiel, Germany e-mail: firstname.lastname@example.org,email@example.com
3 INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy e-mail: firstname.lastname@example.org
4 Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany e-mail: email@example.com
5 Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK e-mail: firstname.lastname@example.org
6 Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany e-mail: email@example.com
Accepted: 9 June 2005
We report the detection of nonradial g-mode oscillations in the DA white dwarfs HS 1039+4112 () and HE 1429-0343 () 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, HS 1039+4112 (Teff K, ) is located near the red edge of the ZZ Ceti instability strip, whereas HE 1429-0343 (Teff K, ) 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%).
Key words: stars: white dwarfs / stars: oscillations / stars: individual: HS 1039+4112, HE 1429-0343
© ESO, 2005
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