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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. 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 |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Journal or Publication Title: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Publisher: | BLACKWELL PUBLISHING |
| ISSN: | 0035-8711 |
| Date: | 11 February 2005 |
| Volume: | 357 |
| Number: | 1 |
| Number of Pages: | 5 |
| Page Range: | pp. 333-337 |
| Identification Number: | 10.1111/j.1365-2966.2005.08649.x |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/7371 |
Data sourced from Thomson Reuters' Web of Knowledge
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