Discovery of fourteen new ZZ Cetis with SOAR

Abstract

We report the discovery of fourteen new ZZ Cetis with the 4.1m Southern Astrophysical Research telescope, at Cerro Pachon, in Chile. The candidates were selected from the SDSS (Sloan Digital Sky Survey) DA white dwarf stars with Teff obtained from the optical spectra fit, inside the ZZ Ceti instability strip. Considering these stars are multi-periodic pulsators and the pulsations propagate to the nucleus of the star, they carry information on the structure of the star and evolution of the progenitors. The ZZ Cetis discovered till 2003 are mainly within 100 pc from the Sun, and probe only the solar vicinity. The recently discovered ones, and those reported here, may sample a distinct population as they were selected mainly perpendicular to the galactic disk and cover a distance up to ~400pc.

12 pages, 2 figures

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• Ensemble Characteristics of the ZZ Ceti stars
• Asteroseismological study of massive ZZ Ceti stars with fully evolutionary models
• Mapping the ZZ Ceti Instability Strip: Discovery of 6 New Pulsators
• Towards a pure ZZ Ceti instability strip
• Four New Massive Pulsating White Dwarfs Including an Ultramassive DAV
• Discovery of eleven new ZZ Ceti stars
• New Pulsating DB White Dwarf Stars from the Sloan Digital Sky Survey
• Mode Identification from Combination Frequency Amplitudes in ZZ Ceti Stars
• Whole Earth Telescope observations of the hot helium atmosphere pulsating white dwarf EC 20058-5234
• Probing the structure of Kepler ZZ Ceti stars with full evolutionary models-based asteroseismology
• Ground based observation of ZZ Ceti stars and the discovery of four new variables
• Astrophysics in 2006
• New ZZ Ceti stars from the LAMOST survey
• Pulsations of the Low Mass ZZ Ceti Star HS 1824+6000