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dc.contributor.authorHoldsworth, Daniel L.
dc.contributor.authorLetarte, B.
dc.contributor.authorKurtz, D.W.
dc.contributor.authorSaio, H.
dc.contributor.authorProvencal, J.L.
dc.date.accessioned2019-07-12T11:50:44Z
dc.date.available2019-07-12T11:50:44Z
dc.date.issued2018
dc.identifier.citationHoldsworth, D.L. et al. 2018. Whole Earth Telescope discovery of a strongly distorted quadrupole pulsation in the largest amplitude rapidly oscillating Ap star. Monthly notices of the Royal Astronomical Society, 473:91-104. [https://doi.org/10.1093/mnras/stx2401]en_US
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/32880
dc.identifier.urihttps://academic.oup.com/mnras/article/473/1/91/4160109?searchresult=1
dc.identifier.urihttps://doi.org/10.1093/mnras/stx2401
dc.description.abstractWe present a new analysis of the rapidly oscillating Ap (roAp) star, 2MASS J19400781 − 4420093 (J1940; V = 13.1). The star was discovered using SuperWASP broad-band photometry to have a frequency of 176.39 d−1 (2041.55 μHz; P = 8.2 min; Holdsworth et al. 2014a) and is shown here to have a peak-to-peak amplitude of 34 mmag. J1940 has been observed during three seasons at the South African Astronomical Observatory, and has been the target of a Whole Earth Telescope campaign. The observations reveal that J1940 pulsates in a distorted quadrupole mode with unusual pulsational phase variations. A higher signal-to-noise ratio spectrum has been obtained since J1940's first announcement, which allows us to classify the star as A7 Vp Eu(Cr). The observing campaigns presented here reveal no pulsations other than the initially detected frequency. We model the pulsation in J1940 and conclude that the pulsation is distorted by a magnetic field of strength 1.5 kG. A difference in the times of rotational maximum light and pulsation maximum suggests a significant offset between the spots and pulsation axis, as can be seen in roAp starsen_US
dc.language.isoenen_US
dc.publisherOxford Univ Pressen_US
dc.subjectAsteroseismologyen_US
dc.subjectTechniques: photometricen_US
dc.subjectStars: chemically peculiaren_US
dc.subjectStars: individual: J1940en_US
dc.subjectStars: magnetic fielden_US
dc.subjectStars: oscillationsen_US
dc.titleWhole Earth Telescope discovery of a strongly distorted quadrupole pulsation in the largest amplitude rapidly oscillating Ap staren_US
dc.typeArticleen_US
dc.contributor.researchID25682016 - Letarte, Bruno


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