期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 433, 期 2, 页码 1599-1606出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt832
关键词
stars: individual: SDSS J000555.90-100213.5; stars: magnetic field; stars: rotation; white dwarfs
资金
- Science and Technology Facilities Council [ST/J000647/1] Funding Source: researchfish
- STFC [ST/J000647/1] Funding Source: UKRI
A surprisingly large fraction (70 per cent) of hot, carbon-dominated atmosphere (DQ) white dwarfs are magnetic and/or photometrically variable on short time-scales up to similar to 1000 s. However, here, we show that the hot DQ magnetic white dwarf SDSS J000555.90-100213.5 is photometrically variable by 11 per cent on a longer time-scale, with a period of 2.110 +/- 0.045 d. We find no evidence of the target fluctuating on short time-scales at an amplitude of less than or similar to +/- 0.5 per cent. Short period hot DQ white dwarfs have been interpreted as non-radial pulsators, but in the case of SDSS J0005-1002, it is more likely that the variability is due to the rotation of the magnetic hot DQ white dwarf. We suggest that some hot DQ white dwarfs, varying on short time-scales, should be more carefully examined to ascertain whether the variability is due to rotation rather than pulsation. All hot DQs should be monitored for long-period modulations as an indicator of rotation and magnetism.
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