两个杂交的B型星系：波江座Nu Eridani和12 Lacertae
The two hybrid B-type pulsators: Nu Eridani and 12 Lacertae
摘要：
丰富的振荡光谱确定的两颗恒星，Nu波江座和12 Lacertae，提出了一个有趣的挑战恒星建模。这些恒星是混合体，在Beta Cep星的典型频率下显示出许多模式，但在SPB星的典型频率下也显示出一种模式。我们构建地震模型，这些恒星考虑不透明度和元素分布的不确定性。我们也提出了估计的内部旋转速率和解决问题的模式激发。我们同时使用OP和OPAL不透明度数据，发现结果存在显著差异。这些数据的不确定性仍然是物体精确建模，特别是估计超调距离的主要障碍。我们发现的证据显着的旋转速率增加之间的信封和核心在两颗星。在用OP数据建立的努额日地震模型中发现了低频g模的不稳定性，但频率高于在该星测得的频率。在12 Lac模型中没有发现这种不稳定性。我们还没有一个令人满意的解释低频模式。在驾驶区的不透明度需要一些增强，但我们认为，它不能实现的铁积累，因为它已经提出。
英文摘要：
The rich oscillation spectra determined for the two stars, Nu Eridani and 12 Lacertae, present an interesting challenge to stellar modelling. The stars are hybrid objects showing a number of modes at frequencies typical for Beta Cep stars but also one mode at frequency typical for SPB stars. We construct seismic models of these stars considering uncertainties in opacity and element distribution. We also present estimate of the interior rotation rate and address the matter of mode excitation. We use both the OP and OPAL opacity data and find significant difference in the results. Uncertainty in these data remains a major obstacle in precise modelling of the objects and, in particular, in estimating the overshooting distance. We find evidence for significant rotation rate increase between envelope and core in the two stars. Instability of low-frequency g-modes was found in seismic models of Nu Eri built with the OP data, but at frequencies higher than those measured in the star. No such instability was found in models of 12 Lac. We do not have yet a satisfactory explanation for low frequency modes. Some enhancement of opacity in the driving zone is required but we argue that it cannot be achieved by the iron accumulation, as it has been proposed.
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