对仙王座β星蛇夫座θ的星震研究：对全局恒星参数和核心过冲的限制
An asteroseismic study of the beta Cephei star theta Ophiuchi: constraints on global stellar parameters and core overshooting
摘要：
我们提出了一个地震研究的β仙王座明星θ蛇夫座。我们的分析是基于一个径向模式，一个旋转分裂的l = 1三重态和三个组件的旋转分裂的l = 2五重态的m值，以及确定光谱的观察。我们将径向模确定为基模，将三重态确定为p_1，将五重态确定为g_1。我们的NLTE丰度分析结果的金属丰度和CNO丰度与最近更新的太阳值完全一致。使用X \in [0.71，0.7211]和Z \in [0.009，0.015]，并使用Asplund等人（2005）的混合物，但Ne丰度大约0.3 dex（Cunha等人，2006年），三种独立模式的匹配，使我们能够推导出质量的限制范围（M = 8.2 +/-0.3 Msun）和中心氢丰度（X_c = 0.38 ± 0.02），并证明了岩心超调的发生（α_ov = 0.44 ± 0.07）。我们还推导出赤道自转速度为29 +/-7 km/s。此外，我们表明，所观察到的非等距的l = 1三重态可以复制的二阶效应的旋转。最后，我们表明，所观察到的旋转分裂的两个模式不能排除刚性旋转模型。
英文摘要：
We present a seismic study of the beta Cephei star theta Ophiuchi. Our analysis is based on the observation of one radial mode, one rotationally split l = 1 triplet and three components of a rotationally split l = 2 quintuplet for which the m-values were well identified by spectroscopy. We identify the radial mode as fundamental, the triplet as p_1 and the quintuplet as g_1. Our NLTE abundance analysis results in a metallicity and CNO abundances in full agreement with the most recent updated solar values. With X \in [0.71,0.7211] and Z \in [0.009,0.015], and using the Asplund et al. (2005) mixture but with a Ne abundance about 0.3 dex larger (Cunha et al. 2006), the matching of the three independent modes, enables us to deduce constrained ranges for the mass (M = 8.2 +/- 0.3 Msun) and central hydrogen abundance (X_c = 0.38 +/- 0.02) of theta Oph and to prove the occurrence of core overshooting (alpha_ov = 0.44 +/- 0.07). We also derive an equatorial rotation velocity of 29 +/- 7 km/s. Moreover, we show that the observed non-equidistance of the l=1 triplet can be reproduced by second order effects of rotation. Finally, we show that the observed rotational splitting of two modes cannot rule out a rigid rotation model.
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