Seismic tests of the structure of rapidly oscillating Ap stars: HR 1217
Seismic tests of the structure of rapidly oscillating Ap stars: HR 1217
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快速振荡 Ap 星结构的地震测试：HR 1217
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Monteiro
中科院分区：
文献类型：
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作者：
M. Cunha;J. Fernandes;M. Monteiro
HR 1217可能是研究得最好的多周期快速振荡Ap星，这使得这颗恒星成为这些复杂恒星地震分析的测试案例。在本文中，我们结合了HR 1217的观测数据，并使用这些数据来约束适合这颗恒星的理论模型。特别是，我们试图确定哪些未知模型参数与再现地震数据最相关。我们发现内部化学成分对HR 1217理论振荡谱的影响大于对流模拟相关参数。重元素丰度较低而氦丰度较大的模型产生的振荡光谱与观测到的更接近。然而，像Matthews等人一样，我们发现很难找到一个可信的模型来重现HR 1217的地震观测，当不考虑可观测值中的不确定性时，除非添加互补效应以解释预期的大频率间隔的减少。
HR 1217 is probably the best studied multiperiodic rapidly oscillating Ap star, which makes this star a test case for the seismic analysis of these complex stars. In this paper, we combine the observational data available for HR 1217 and use these data to constrain theoretical models appropriate for this star. In particular, we try to establish which unknown model parameters are the most relevant to reproduce the seismic data. We find that the interior chemical composition has more impact in the theoretical oscillation spectrum of HR 1217 than parameters related to the modelling of convection. Models with lower abundances of heavy elements and larger abundances of helium produce oscillation spectra that are closer to that observed. However, like Matthews et al., we show that it is difficult to find a plausible model that can reproduce the seismic observations of HR 1217, when the uncertainties in the observables are not taken into account, unless a complementary effect is added in order to account for a decrease in the expected large frequency separations.