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Kepler photometry of KIC 10661783: a binary star with total eclipses and delta Scuti pulsat (CROSBI ID 169649)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Southworth, John ; Zima, Wolfgang ; Aerts, Conny ; Bruntt, Hans ; Lehmann, H., ; Kim, S.-L. ; Kurtz, D.W. ; Pavlovski, Krešimir ; Prša, Andrej ; Smalley, Barry et al. Kepler photometry of KIC 10661783: a binary star with total eclipses and delta Scuti pulsat // Monthly notices of the Royal Astronomical Society, 414 (2011), 3; 2413-2423. doi: 10.1111/j.1365-2966.2011.18559.x

Podaci o odgovornosti

Southworth, John ; Zima, Wolfgang ; Aerts, Conny ; Bruntt, Hans ; Lehmann, H., ; Kim, S.-L. ; Kurtz, D.W. ; Pavlovski, Krešimir ; Prša, Andrej ; Smalley, Barry ; Gilliland, R.L. ; Christensen'Dalsgaard, J. ; Kawaler, S.D. ; Kjeldsen, H. ; Cote, M.T. ; Tenenbaum, P. ; Twicken, J.D.

engleski

Kepler photometry of KIC 10661783: a binary star with total eclipses and delta Scuti pulsat

We present Kepler satellite photometry of KIC 10661783, a short-period binary star system which shows total eclipses and multi-periodic delta Scuti pulsations. A frequency analysis of the eclipse-subtracted light curve reveals at least 68 frequencies of which 55 or more can be attributed to pulsation modes. The main limitation on this analysis is the frequency resolution within the 27-day short-cadence light curve. Most of the variability signal lies in the frequency range 18 to 31 c/d, with amplitudes between 0.1 and 4 mmag. One harmonic term (2.f) and a few combination frequencies (f_i+f_j) have been detected. From a plot of the residuals versus orbital phase we assign the pulsations to the primary star in the system. The pulsations were removed from the short-cadence data and the light curve was modelled using the Wilson-Devinney code. We are unable to get a perfect fit due to the residual effects of pulsations and also to the treatment of reflection and reprocessing in the light curve model. A model where the secondary star fills its Roche lobe is favoured, which means that KIC 10661783 can be classified as an oEA system. Further photometric and spectroscopic observations will allow the masses and radii of the two stars to be measured to high precision and hundreds of delta Scuti pulsation frequencies to be resolved. This could lead to unique constraints on theoretical models of delta Scuti stars, if the evolutionary history of KIC 10661783 can be accounted for.

stars; binary stars; variable stars; stellar oscillations

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Podaci o izdanju

414 (3)

2011.

2413-2423

objavljeno

0035-8711

10.1111/j.1365-2966.2011.18559.x

Povezanost rada

Fizika

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