New developments of the ZZ Ceti instability strip: The discovery of eleven new variables

Details New developments of the ZZ Ceti instability strip: The discovery of eleven new variables New developments of the ZZ Ceti instability strip: The discovery of eleven new variables

2010-07-04

arxiv.org/abs/1007.0524v1

2010MNRAS.tmp..654C

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

17 pages, 5 figures

Scientific paper

10.1111/j.1365-2966.2010.16633.x

Using the SOAR 4.1 m telescope, we report on the discovery of low amplitude pulsations for three stars previously reported as Not-Observed-to-Vary (NOV) by Mukadam et al. (2004) and Mullally et al. (2005), which are inside the ZZ Ceti instability strip. With the two pulsators discovered by Castanheira et al. (2007), we have now found variability in a total of five stars previously reported as NOVs. We also report the variability of eight new pulsating stars, not previously observed, bringing the total number of known ZZ Ceti stars to 148. In addition, we lowered the detection limit for ten NOVs located near the edges of the ZZ Ceti instability strip. Our results are consistent with a pure mass dependent ZZ Ceti instability strip.

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