Might intermediate-order g modes observed in the CoRoT hybrid γ Doradus/δ Scuti star HD 49434 be stochastically excited?

T. L. Campante, A. Grigahcène, J.-C. Suárez, M. J. P. F. G. Monteiro

Abstract
The primary target in the seismo-field of CoRoT, HD 49434, known to be a bona fide hybrid γ Doradus/δ Scuti, shows excited intermediate-order g modes. Time-Dependent Convection models, however, predict a range in frequency that is stable to pulsations, between the simultaneously excited high-order g modes (γ Dor) and low-order p and g modes (δ Sct). Furthermore, theoretical studies based on model computations of δ Sct stars suggest that stochastically excited modes are likely to be observed. A pertinent question would then be to ask: Might those observed intermediate-order g modes be stochastically excited? By employing a statistical method which searches for the signature of stochastic excitation in stellar pulsations, we investigate the nature of those modes with possible implications on the identification of their excitation mechanism. Preliminary results are rather inconclusive about the presence of stochastic excitation. A new analysis that thoroughly takes into account sampling effects is necessary in order to get more reliable results.

Seismological Challenges for Stellar Structure, HELAS IV
(Eds.) T. Roca, P. Palle, S. Jimenez

Astronomische Nachrichten
Vol. 331, Page P40_1
2010

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