Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 688, Issue 2, Pages L95-L98Publisher
IOP PUBLISHING LTD
DOI: 10.1086/595584
Keywords
stars: oscillations; stars: variables: other; white dwarfs
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Funding
- National Science Foundation [AST-0707381]
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We have discovered periodic variations in the light curves of two hot DQ stars from the Sloan Digital Sky Survey, SDSS J220029.08-074121.5 and SDSS J234843.30-094245.3. These are the second and third variables detected among the hot DQs and confirm the existence of a new class of variable white dwarf stars. The amplitudes of the variations are one half as large as those detected in the first discovered variable, SDSS J142625.71 + 575218.3, and required high signal-to-noise photometry to detect. The pulse shapes of the stars are not like those of known white dwarf pulsators but are similar to the first hot DQ variable, SDSS J142625.71 + 575218.3.
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