论文标题
通过光度变异的幅度来限制年轻恒星簇的年龄
Constraining the age of young stellar clusters via the amplitude of photometric variability
论文作者
论文摘要
确定恒星年龄是天体物理学研究中的关键任务。如今，使用了不同的方法，既可以使用模型依赖或基于校准的经验关系。当以互补方式使用不同的方法时，通常会获得最可靠的结果。我们提出了一种新方法，用于确定年轻恒星关联和开放群集（年龄<125 Myr），该方法可以允许与其他方法一起使用时进一步限制年龄。 We explore the amplitude of the photometric variability in bins of color and rotation period of five young associations and clusters spanning an interval of ages from 1-3 Myr to 625 Myr (Taurus, rho Ophiuchi, Upper Scorpius, Pleiades, and Praesepe), which all have high-quality time-series photometry from Kepler K2 campaigns.在低质量状态下，我们发现具有相似颜色和旋转期间但不同年龄的恒星表现出其光度变异性的不同幅度，年轻的恒星比较老的恒星显示出更大的光度变异性。具有相似颜色和旋转周期的恒星中光度变异性振幅与年龄的下降可以原则上校准，并作为额外的经验关系，以限制年轻关联和开放群集的年龄，但前提是时间序列光度计可以用于其低质量成员。
Determination of stellar age is a crucial task in astrophysics research. Different methods are nowadays used either model dependent or based on calibrated empirical relations. The most reliable results are generally obtained when different methods are used in complementary way. We propose a new method for the age determination of young stellar associations and open clusters (ages < 125 Myr), which can allow to further constrain the age when used together with other methods. We explore the amplitude of the photometric variability in bins of color and rotation period of five young associations and clusters spanning an interval of ages from 1-3 Myr to 625 Myr (Taurus, rho Ophiuchi, Upper Scorpius, Pleiades, and Praesepe), which all have high-quality time-series photometry from Kepler K2 campaigns. In the low-mass regime, we find that stars with similar color and rotation period but different ages exhibit different amplitudes of their photometric variability, with younger stars showing a larger photometric variability than older stars. The decline of photometric variability amplitude versus age in stars with similar color and rotation period can be in principle calibrated and be adopted as an additional empirical relation to constrain the age of young associations and open clusters, provided that time-series photometry is available for their low-mass members.
