标题： 在CoRoT混合伽马多拉/脉动白矮星HD 49434中观测到的中间阶g模式是否可能被随机激发？ 显示英文标题

标题： Might intermediate-order g modes observed in the CoRoT hybrid gamma Doradus/delta Scuti star HD 49434 be stochastically excited?

摘要： 在CoRoT的地震学领域中，主要目标HD 49434，已知是一种真正的混合gamma Doradus/delta Scuti，显示出被激发的中间阶g模式。 然而，时间依赖性对流模型预测了一个频率范围，该范围对脉动是稳定的，在同时被激发的高阶g模式（gamma Dor）和低阶p和g模式（delta Sct）之间。 此外，基于delta Sct恒星模型计算的理论研究建议，随机激发的模式可能被观测到。 那么一个相关的问题是：那些观测到的中间阶g模式是否可能是随机激发的？ 通过采用一种统计方法，在恒星脉动中寻找随机激发的特征，我们研究了这些模式的性质，并可能对其激发机制的识别产生影响。 初步结果对于随机激发的存在性并不明确。 为了获得更可靠的结果，需要进行一项全面考虑采样效应的新分析。 显示英文摘要

摘要： The primary target in the seismo-field of CoRoT, HD 49434, known to be a bona fide hybrid gamma Doradus/delta 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 (gamma Dor) and low-order p and g modes (delta Sct). Furthermore, theoretical studies based on model computations of delta 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.