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A New Small-Amplitude Variable Hot DQ White Dwarf

We present the discovery of photometric variations in the carbon-dominated atmosphere (hot DQ) white dwarf star SDSS J133710.19-002643.6. We find evidence for two low-amplitude, harmonically-related periodicities at 169 s and 339 s, making it the fastest and smallest amplitude of the four known hot DQ variables and the only variable whose spectrum suggests the presence of hydrogen. The star's fundamental and harmonic amplitudes are roughly equal, and its pulse shape is similar to the other two members of the class with detected harmonics. Like the other variables, it appears relatively stable in frequency and amplitude.

preprint2010arXivOpen access
B. H. DunlapB. N. BarlowJ. C. Clemens
astro-ph.SR
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Open access3 authors1 topic
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B. H. DunlapB. N. BarlowJ. C. Clemens

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