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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Asteroseismology of KIC 11754974: A high-amplitude SX Phe pulsator in a 343-d binary system
Monthly Notices of the Royal Astronomical Society, Volume 432, No. 3, Year 2013
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Description
The candidate SX Phe star KIC 11754974 shows a remarkably high number of combination frequencies in the Fourier amplitude spectrum: 123 of the 166 frequencies in our multifrequency fit are linear combinations of independent modes. Predictable patterns in frequency spacings are seen in the Fourier transform of the light curve. We present an analysis of 180 d of short-cadence Kepler photometry and of new spectroscopic data for this evolved, late A-type star. We infer from the 1150-d, long-cadence light curve, and in two different ways, that our target is the primary of a 343-d, non-eclipsing binary system. According to both methods, the mass function is similar, f (M) = 0.0207 ± 0.0003M⊙. The observed pulsations are modelled extensively, using separate, state-of-the-art, time-dependent convection (TDC) and rotating models. The models match the observed temperature and low metallicity, finding a mass of 1.50-1.56M⊙. The models suggest that the whole star is metal poor, and that the low metallicity is not just a surface abundance peculiarity. This is the best frequency analysis of an SX Phe star, and the only Kepler δ Sct star to be modelled with both TDC and rotating models. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Murphy, Simon J.
United Kingdom, Preston
University of Central Lancashire
Portugal, Porto
Centro de Astrofísica da Universidade do Porto
Pigulski, Andrzej
Poland, Wroclaw
University of Wroclaw
Kurtz, Donald W.
United Kingdom, Preston
University of Central Lancashire
Suárez, J. C.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Handler, Gerald
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Balona, Luis A.
South Africa, Cape Town
South African Astronomical Observatory
Smalley, Barry S.
United Kingdom, Keele
Keele University
Uytterhoeven, Katrienu
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Szabó, Róbert
Hungary, Budapest
Magyar Tudomanyos Akademia
Thygesen, Anders O.
Germany, Heidelberg
Landessternwarte Heidelberg
Spain, Brena Baja
Nordic Optical Telescope
Elkin, Vladimir G.
United Kingdom, Preston
University of Central Lancashire
Breger, Michael
Austria, Vienna
Institut Für Astrophysik
United States, Austin
The University of Texas at Austin
Grigahcène, Ahmed
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Guzik, Joyce Ann
United States, Los Alamos
Los Alamos National Laboratory
Nemec, James M.
Canada, Victoria
Camosun College
Southworth, John K.
United Kingdom, Keele
Keele University
Statistics
Citations: 32
Authors: 16
Affiliations: 16
Identifiers
Doi:
10.1093/mnras/stt587
ISSN:
00358711
e-ISSN:
13652966