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arXiv 0807.3567astro-ph
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半经验白矮星初末质量关系:对由于恒星演化模型引起的系统不确定性的彻底分析

Semi-empirical white dwarf initial-final mass relationships: a thorough analysis of systematic uncertainties due to stellar evolution models

Maurizio Salaris, Aldo Serenelli, Achim Weiss, Marcelo Miller Bertolami

摘要:

利用10个疏散星团中白矮星的最新研究结果,我们重新审视了星团初终质量关系的半经验估计,重点是使用恒星演化模型。我们讨论了这些模型的影响,每一步的推导。我们工作的一个目的是使用一致的计算等时线和白矮星冷却轨道。二是推导了恒星演化理论中系统误差的范围。这是通过使用恒星模型的不同来源和不同的物理假设和输入数据来实现的。我们发现,系统误差,包括年龄的确定,是主导的初始质量值,而观测的不确定性影响的最终质量主要。在确定了系统误差之后,初始-最终质量关系使我们最终能够得出关于恒星模型物理学的结论,特别是关于对流过冲的结论。

英文摘要:

Using the most recent results about white dwarfs in 10 open clusters, we revisit semi-empirical estimates of the initial-final mass relation in star clusters, with emphasis on the use of stellar evolution models. We discuss the influence of these models on each step of the derivation. One intention of our work is to use consistent sets of calculations both for the isochrones and the white dwarf cooling tracks. The second one is to derive the range of systematic errors arising from stellar evolution theory. This is achieved by using different sources for the stellar models and by varying physical assumptions and input data. We find that systematic errors, including the determination of the cluster age, are dominating the initial mass values, while observational uncertainties influence the final mass primarily. After having determined the systematic errors, the initial-final mass relation allows us finally to draw conclusions about the physics of the stellar models, in particular about convective overshooting.

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