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Paper: The Frequency Stability of the Pulsating White Dwarf L19-2
Volume: 493, 19th European Workshop on White Dwarfs
Page: 199
Authors: Sullivan, D. J.; Chote, P.
Abstract: The hydrogen atmosphere DA white dwarf L 19–2 has proven to be a very stable pulsator. We now have access to nearly four decades of time-series photometry on this star, including a Whole Earth Telescope (WET) run on the object in 1995, and subsequent observations from Mt John University Observatory in NZ employing both P/M photometry and, more recently, CCD photometry. The brightness of the star combined with its southern declination (–81 degrees) makes it a suitable backup object for southern hemisphere observing plans, and this is the origin of much of our time-series data. This DAV white dwarf has two pulsation modes that are suitable for measuring Pdot values, predicted to arise from evolutionary cooling; we present our latest analysis.
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