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Title: SDSS J000555.90-100213.5: a hot, magnetic carbon-dominated atmosphere WD rotating with a 2.1 d period
Authors: Lawrie, K. A.
Burleigh, Matthew R.
Dufour, P.
Hodgkin, S. T.
First Published: 4-Jun-2013
Publisher: Oxford University Press for Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2013, 433 (2), pp. 1599-1606
Abstract: 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 ∼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 ≲±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.
DOI Link: 10.1093/mnras/stt832
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2013, Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License ( ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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