Photometry of the magnetic white dwarf SDSS 121209.31+013627.7 |
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Authors: | C. Koen P. F. L. Maxted |
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Affiliation: | Department of Statistics, University of the Western Cape, Private Bag X17, Bellville, 7535 Cape, South Africa;Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG |
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Abstract: | The results of 27 h of time series photometry of SDSS 121209.31+013627.7 are presented. The binary period established from spectroscopy is confirmed and refined to 0.061 412 d (88.43 min). The photometric variations are dominated by a brightening of about 16 mmag, lasting a little less than half a binary cycle. The amplitude is approximately the same in V , R and white light. A secondary small brightness increase during each cycle may also be present. We speculate that SDSS 121209.31+013627.7 may be a polar in a low state. |
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Keywords: | binaries: close stars: individual: SDSS 121209.31+013627.7 stars: low mass, brown dwarfs stars: variables: other |
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