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Paper: Two New ZZ Ceti Pulsators from the HS and HE Surveys
Volume: 334, 14th European Workshop on White Dwarfs
Page: 651
Authors: Silvotti, R.; Voss, B.; Koester, D.; Bruni, I.
Abstract: We report the detection of short-period oscillations in the DA WDs HS 1039+4112 (B=15.9) and HE 1429−0343 (B=15.8) from time-series photometry made at the Loiano 1.5m telescope. Both stars were previously identified as probable pulsators by spectral analysis or two-color photometry. Following our temperature and surface gravity determinations, HS 1039+4112 (Teff = 11200K, log g = 8.2) is located near the red edge of the ZZ Ceti instability strip, whereas HE 1429−0343 (Teff = 11400K, log g = 8.0) falls in the middle of the strip. Both stars show a multi-mode behavior with the main periods at about 851 and 969 s respectively, and relatively large amplitudes (≈7% and ≈2.5%).
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