Rotating models of young solar-type stars Exploring braking laws and angular momentum transport processes
Rotating models of young solar-type stars Exploring braking laws and angular momentum transport processes
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DOI：
10.1051/0004-6361/201527349
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发表时间：
2016-03-01
影响因子：
6.5
通讯作者：
Bouvier, J.
中科院分区：
文献类型：
--
作者：
Amard, L.;Palacios, A.;Bouvier, J.
语境。了解恒星角动量演化是现代恒星物理学面临的最大挑战之一。我们利用包括物理成分的一维旋转演化模型研究太阳型恒星从前主序带到太阳时代的预测旋转演化。方法。我们按照 Maeder 和 Zahn 的方法，使用代码 STAREVOL 计算了太阳型恒星的旋转演化模型，包括外部恒星风力矩和内部角动量传输。我们探索了文献中可用的不同形式和规定。我们根据来自广泛光度测量的最近旋转周期数据、年轻星团中太阳质量恒星的锂丰度以及太阳的日震旋转剖面测试了模型的预测。结果。我们找到了内部传输和表面角动量提取的最佳匹配处方组合。这种组合非常适合观测到的太阳类恒星从早期演化到太阳年龄的自转周期演化。此外，我们还表明，快速旋转体的辐射区域和对流包络线之间的耦合更强。然而，无论采用哪一套规定，我们都无法同时再现表面角速度和太阳的内部轮廓或锂丰度的演变。结论。我们证实了这样的想法：在太阳型恒星达到太阳年龄之前，必须存在额外的传输机制。这些过程是否与解释更高级演化阶段的最新星震数据所需的过程相同仍然是一个悬而未决的问题。
Context. Understanding the angular momentum evolution of stars is one of the greatest challenges of modern stellar physics.Aims. We study the predicted rotational evolution of solar-type stars from the pre-main sequence to the solar age with 1D rotating evolutionary models including physical ingredients.Methods. We computed rotating evolution models of solar-type stars including an external stellar wind torque and internal transport of angular momentum following the method of Maeder and Zahn with the code STAREVOL. We explored different formalisms and prescriptions available from the literature. We tested the predictions of the models against recent rotational period data from extensive photometric surveys, lithium abundances of solar-mass stars in young clusters, and the helioseismic rotation profile of the Sun.Results. We find a best-matching combination of prescriptions for both internal transport and surface extraction of angular momentum. This combination provides a very good fit to the observed evolution of rotational periods for solar-type stars from early evolution to the age of the Sun. Additionally, we show that fast rotators experience a stronger coupling between their radiative region and the convective envelope. Regardless of the set of prescriptions, however, we cannot simultaneously reproduce surface angular velocity and the internal profile of the Sun or the evolution of lithium abundance.Conclusions. We confirm the idea that additional transport mechanisms must occur in solar-type stars until they reach the age of the Sun. Whether these processes are the same as those needed to explain recent asteroseismic data in more advanced evolutionary phases is still an open question.