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Rotational period of WD 1953-011 - a magnetic white dwarf with a star-spot
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UNSPECIFIED (2005) Rotational period of WD 1953-011 - a magnetic white dwarf with a star-spot. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 357 (1). pp. 333-337. doi:10.1111/j.1365-2966.2005.08649.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2005.08649.x
Abstract
WD 1953- 011 is an isolated, cool (7920 +/- 200 K) magnetic white dwarf (MWD) with a low average field strength ( similar to 70 kG), and a higher than average mass ( similar to 0.74 M.). Spectroscopic observations taken by Maxted et al. showed variations of equivalent width in the Balmer lines, unusual in a low- field white dwarf. Here we present V- band photometry of WD 1953- 011 taken at seven epochs over a total of 22 months. All of the data sets show a sinusoidal variation of approximately 2 per cent peak- to- peak amplitude. We propose that these variations are due to a star- spot on the MWD, analogous to a sunspot, which is affecting the temperature at the surface, and therefore its photometric magnitude. The variations have a best- fitting period over the entire 22 months of 1.4418 d, which we interpret as the rotational period of the white dwarf.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Journal or Publication Title: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | ||||
Publisher: | BLACKWELL PUBLISHING | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 11 February 2005 | ||||
Dates: |
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Volume: | 357 | ||||
Number: | 1 | ||||
Number of Pages: | 5 | ||||
Page Range: | pp. 333-337 | ||||
DOI: | 10.1111/j.1365-2966.2005.08649.x | ||||
Publication Status: | Published |
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