AAS 205th Meeting, 9-13 January 2005
Session 103 White Dwarfs
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

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[103.02] Pulsating White Dwarf Star GD99

K.M. Chynoweth, S. Thompson (Colorado College), F. Mullally (University of Texas), C. Yeates (University of North Carolina)

We present 15 hours of time-series photometry of the variable white dwarf star GD99. These data were obtained at the McDonald Observatory 2.1m Otto Struve Telescope in January 2003, using the Argos CCD photometer. We achieved a noise level as low as 0.07 %, as measured from the power spectrum of our first night. Our observations confirm that GD99 is a unique pulsating white dwarf whose modes show characteristics of both the hot and cold type of DA variable stars. Additionally, GD99 has a large number of modes, making it a good candidate for asteroseismological study. Our preliminary results indicate that this star merits further study to decipher its abundant set of unusual modes. With such a rich period structure, longer continuous data sets will be required to fully resolve the pulsation spectrum.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.