Pulsation models for the roAp star HD 134214

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dc.creator Saio, H.
dc.creator Gruberbauer, Michael
dc.creator Weiss, W. W.
dc.creator Matthews, J. M.
dc.creator Ryabchikova, T.
dc.date.accessioned 2018-04-19T13:48:54Z
dc.date.available 2018-04-19T13:48:54Z
dc.date.issued 2012-02
dc.identifier.issn 0035-8711
dc.identifier.uri http://library2.smu.ca/handle/01/27429
dc.description Publisher's Version/PDF
dc.description.abstract Precise time series photometry with the MOST satellite has led to identification of 10 pulsation frequencies in the rapidly oscillating Ap (roAp) star HD134214. We have fitted the observed frequencies with theoretical frequencies of axisymmetric modes in a grid of stellar models with dipole magnetic fields. We find that, among models with a standard composition of (X, Z) = (0.70, 0.02) and with suppressed convection, eigenfrequencies of a 1.65M<sub>☉</sub> model with log T<sub>eff</sub> =3.858 and a polar magnetic field strength of 4.1 kG agree best with the observed frequencies. We identify the observed pulsation frequency with the largest amplitude as a deformed dipole (𝓁 = 1) mode, and the four next largest amplitude frequencies as deformed&nbsp;𝓁 = 2 modes. These modes have a radial quasi-node in the outermost atmospheric layers (&tau; &sim; 10<sup>&minus;3</sup>). Although the model frequencies agree roughly with observed ones, they are all above the acoustic cut-off frequency for the model atmosphere and hence are predicted to be damped. The excitation mechanism for the pulsations of HD134214 is not clear, but further investigation of these modes may be a probe of the atmospheric structure in this magnetic chemically peculiar star.&nbsp; en_CA
dc.language.iso en en_CA
dc.publisher Oxford University Press en_CA
dc.relation.uri https://dx.doi.org/10.1111/j.1365-2966.2011.20031.x
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.subject.lcsh Peculiar stars
dc.subject.lcsh Stars -- Magnetic fields
dc.subject.lcsh Stellar oscillations
dc.subject.lcsh Ap stars
dc.title Pulsation models for the roAp star HD 134214 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Monthly Notices of the Royal Astronomical Society 420(1), 283-290. (2012) en_CA


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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
 
Published Version: https://dx.doi.org/10.1111/j.1365-2966.2011.20031.x
 
 

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