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Kepler K2observations of the intermediate polar FO Aquarii
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Kennedy, M. R., Garnavich, P., Breedt, E., Marsh, T. R., Gänsicke, B. T. (Boris T.), Steeghs, D., Szkody, P. and Dai, Z. (2016) Kepler K2observations of the intermediate polar FO Aquarii. Monthly Notices of the Royal Astronomical Society, 459 (4). pp. 3622-3628. doi:10.1093/mnras/stw834 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stw834
Abstract
We present photometry of the intermediate polar FO Aquarii (FO Aqr) obtained as part of the K2 mission using the Kepler space telescope. The amplitude spectrum of the data confirms the orbital period of 4.8508(4) h, and the shape of the light curve is consistent with the outer edge of the accretion disc being eclipsed when folded on this period. The average flux of FO Aqr changed during the observations, suggesting a change in the mass accretion rate. There is no evidence in the amplitude spectrum of a longer period that would suggest disc precession. The amplitude spectrum also shows the white dwarf spin period of 1254.3401(4) s, the beat period of 1351.329(2) s, and 31 other spin and orbital harmonics. The detected period is longer than the last reported period of 1254.284(16) s, suggesting that FO Aqr is now spinning down, and has a positive P˙. There is no detectable variation in the spin period over the course of the K2 observations, but the phase of the spin cycle is correlated with the system brightness. We also find that the amplitude of the beat signal is correlated with the system brightness.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Stars -- Magnetic fields, White dwarf stars, Accretion (Astrophysics), Protoplanetary disks, Cataclysmic variable stars, Astrophysics | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press | ||||||||
ISSN: | 0035-8711 | ||||||||
Official Date: | 20 April 2016 | ||||||||
Dates: |
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Volume: | 459 | ||||||||
Number: | 4 | ||||||||
Page Range: | pp. 3622-3628 | ||||||||
DOI: | 10.1093/mnras/stw834 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 14 March 2017 | ||||||||
Date of first compliant Open Access: | 14 March 2017 | ||||||||
Funder: | National Science Foundation (U.S.) (NSF), Naughton Foundation, University College, Cork (UCC), Science and Technology Facilities Council (Great Britain) (STFC), European Research Council (ERC), Zhongguo ke xue yuan [Chinese Academy of Sciences] (CAS) | ||||||||
Grant number: | AST-1514737 (NSF), ST/L000733 (STF), 320964 (ERC) |
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