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Kepler K2 observations of the intermediate polar FO Aquarii
Kennedy, M. R.1,2; Garnavich, P.2; Breedt, E.3; Marsh, T. R.3; Gansicke, B. T.3; Steeghs, D.3; Szkody, P.4; Dai ZB(戴智斌)5,6
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-07-11
Volume459Issue:4Pages:3622-3628
DOI10.1093/mnras/stw834
Contribution Rank第5完成单位
Indexed BySCI
KeywordAccretion Accretion Discs Magnetic Fields - Eclipses Novae Cataclysmic Variables White Dwarfs
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)over dot. 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.

Funding ProjectNSF[AST-1514737] ; Naughton Foundation ; UCC Strategic Research Fund ; STFC[ST/L000733] ; ERC[320964] ; CAS 'Light of West China" Program'
Funding OrganizationNSF[AST-1514737] ; Naughton Foundation ; UCC Strategic Research Fund ; STFC[ST/L000733] ; ERC[320964] ; CAS 'Light of West China" Program'
Language英语
Subject Area天文学 ; 天体物理学 ; 实测天体物理学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000379830700020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMAGNETIC NEUTRON-STARS ; DQ HERCULIS STARS ; RMS-FLUX RELATION ; CATACLYSMIC VARIABLES ; CCD PHOTOMETRY ; WHITE-DWARF ; SPIN EPHEMERIDES ; DISK ACCRETION ; SPACED DATA ; H2215-086
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9717
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorKennedy, M. R.
Affiliation1.Department of Physics, University College Cork, Cork, T12 ND89, Ireland
2.Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
3.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
4.Department of Astronomy, University of Washington, Seattle, WA 98195-1580, USA
5.Yunnan Observatories, Chinese Academy of Sciences, Guandu, Kunming 650011, Yunnan, China
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Guandu, Kunming 650011, Yunnan, China
Recommended Citation
GB/T 7714
Kennedy, M. R.,Garnavich, P.,Breedt, E.,et al. Kepler K2 observations of the intermediate polar FO Aquarii[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,459(4):3622-3628.
APA Kennedy, M. R..,Garnavich, P..,Breedt, E..,Marsh, T. R..,Gansicke, B. T..,...&Dai ZB.(2016).Kepler K2 observations of the intermediate polar FO Aquarii.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,459(4),3622-3628.
MLA Kennedy, M. R.,et al."Kepler K2 observations of the intermediate polar FO Aquarii".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459.4(2016):3622-3628.
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