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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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