Mapping the ZZ Ceti Instability Strip: Discovery of 6 New Pulsators

Abstract

As part of an ongoing program to map better the empirical instability strip of pulsating ZZ Ceti white dwarfs, we present a brief progress report based on our last observing season. We discuss here high-speed photometric measurements for 6 new pulsators. These stars were selected on the basis of preliminary measurements of their effective temperature and surface gravity that placed them inside or near the known ZZ Ceti instability strip. We also report detection limits for a number of DA white dwarfs that showed no sign of variability. Finally, we revisit the ZZ Ceti star G232-38 for which we obtained improved high-speed photometry.

arXiv comment5 pages, 5 figures, 4 tables, accepted for publication in the Astronomical Journal

References in corpus (5)

• Towards an Empirical Determination of the ZZ Ceti Instability Strip
• Radial velocity measurements of white dwarfs
• Re-defining the Empirical ZZ Ceti Instability Strip
• Discovery of fourteen new ZZ Cetis with SOAR
• Discovery of eleven new ZZ Ceti stars

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