New Pulsating DB White Dwarf Stars from the Sloan Digital Sky Survey
arXiv:0809.0921 · doi:10.1088/0004-637X/690/1/560
Abstract
We are searching for new He atmosphere white dwarf pulsators (DBVs) based on the newly found white dwarf stars from the spectra obtained by the Sloan Digital Sky Survey. DBVs pulsate at hotter temperature ranges than their better known cousins, the H atmosphere white dwarf pulsators (DAVs or ZZ Ceti stars). Since the evolution of white dwarf stars is characterized by cooling, asteroseismological studies of DBVs give us opportunities to study white dwarf structure at a different evolutionary stage than the DAVs. The hottest DBVs are thought to have neutrino luminosities exceeding their photon luminosities (Winget et al. 2004), a quantity measurable through asteroseismology. Therefore, they can also be used to study neutrino physics in the stellar interior. So far we have discovered nine new DBVs, doubling the number of previously known DBVs. Here we report the new pulsators' lightcurves and power spectra.
15 pages, 2 figures, 3 tables, ApJ accepted
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Cited by in corpus (7)
- Gaia Data Release 3: All-sky classification of 12.4 million variable sources into 25 classes
- Gaia Data Release 3: Cross-match of Gaia sources with variable objects from the literature
- Detections and Constraints on White Dwarf Variability from Time-Series GALEX Observations
- On the existence of warm H-rich pulsating white dwarfs
- Systematic uncertainties in the characterisation of helium-dominated metal-polluted white dwarf atmospheres
- Time series photometry of the helium atmosphere pulsating white dwarf EC 04207-474
- The Pulsating Helium-Atmosphere White Dwarfs I: New DBVs from the Sloan Digital Sky Survey